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modern periodic table given by moseley

Experts have speculated that Moseley could otherwise have been awarded the Nobel Prize in Physics in 1916. In some cases, Moseley found it necessary to modify his equipment to detect particularly soft [lower frequency] X-rays that could not penetrate either air or paper, by working with his instruments in a vacuum chamber. Simple modification of Rydberg's and Bohr's formulas were found to give theoretical justification for Moseley's empirically derived law for determining atomic numbers. Moseley could have been awarded the Nobel Prize in Physics in 1916, if he Had the European War had no other result than the snuffing out of this young life, that alone would make it one of the most hideous and most irreparable crimes in history. Skip to main content Search This Blog Chemistry, Physics & Bio Notes Best Notes for Chemistry, Physics and Biology … on their known chemical and physical properties, even though they have "[25], Isaac Asimov wrote, "In view of what he [Moseley] might still have accomplished … his death might well have been the most costly single death of the War to mankind generally. "Siegbahn, who carried on Moseley's work, received one [a Nobel Prize in Physics, in 1924]. Modern Periodic Table: In 1913, an English physicist, Henry Moseley showed that the physical and chemical properties of the atoms of the elements are determined by their atomic number and not by their atomic masses. In a paper dated December 1869 which appeared early in 1870, Meyer published a new periodic table of 55 elements, in which the series of periods are ended by an element of the alkaline earth metal group. Then, in 1915, William Henry Bragg and William Lawrence Bragg, a British father-son pair, shared this Nobel Prize for their discoveries in the reverse problem – determining the structure of crystals using X-rays (Robert Charles Bragg, William Henry Bragg's other son, had also been killed at Gallipoli, on 2 September 1915[26]). objective measurements of their atomic numbers. and the central block (the transition metals). Moseley was shot and killed during the Battle of Gallipoli on 10 August 1915, at the age of 27. tellurium - so, even though he didn't know why, [12]:126, The Institute of Physics Henry Moseley Medal and Prize is named in his honour. Niels bohr proposed atomic model and Moseley prepared the modern periodic table Adith RK answered Mar 21, 2017 In 1914, a year before he was killed in action at Gallipoli, the English physicist Henry … In 1914, Max von Laue of Germany won the Nobel Prize in Physics for his discovery of the diffraction of X-rays by crystals, which was a crucial step towards the invention of X-ray spectroscopy. of the British Army. By restructuring Mendeleev’s Periodic table using his results, Moseley was further able to show that four elements were missing, 43, 61. The modern periodic table was given by Moseley with some particular modifications, while the other was introduced by renowned scientist Mendeleev. In addition, Moseley predicted the existence of two more undiscovered elements, those with the atomic numbers 72 and 75, and gave very strong evidence that there were no other gaps in the Periodic Table between the elements aluminium (atomic number 13) and gold (atomic number 79). The law had been discovered and published by the English physicist Henry Moseley in 1913-1914. (This was later to be the basis of the Aufbau principle in atomic studies.) nearly the same atomic masses. [1][2] Until Moseley's work, "atomic number" was merely an element's place in the periodic table … table - but in order to get iodine in the same group as other elements with Moseley's law is an empirical law concerning the characteristic x-rays emitted by atoms. See also: Quite a few years later, this element 61 was created artificially in nuclear reactors and was named promethium.[15][16][17][18][19]. In 1913, Moseley observed and measured the X-ray spectra of various chemical elements (mostly metals) that were found by the method of diffraction through crystals. His father Henry Nottidge Moseley (1844–1891), who died when Moseley was quite young, was a biologist and also a professor of anatomy and physiology at the University of Oxford, who had been a member of the Challenger Expedition. Period four and five have eighteen elements and are known as the long group. Additional credence is given to this idea by noting the recipients of the Nobel Prize in Physics in the two preceding years, 1914 and 1915, and in the following year, 1917. are arranged according to increasing atomic number. Henry Gwyn Jeffreys Moseley (23 November 1887 – 10 August 1915). The rebound of electrons into these holes in the inner shells next causes the emission of X-ray photons that were led out of the tube in a semi-beam, through an opening in the external X-ray shielding. He is one of the immortals of science, and though he would have made many other additions to our knowledge if his life had been spared, the contributions already credited to him were of such fundamental significance, that the probability of his surpassing himself was extremely small. Moseley Killed in Action", "The attainment of high potentials by the use of Radium", "The high-frequency spectra of the elements", "Rediscovery of the elements: The Rare Earths–The Last Member", "Rediscovery of the elements: The Rare Earths–The Confusing Years", "Casualty Details: Bragg, Robert Charles", https://en.wikipedia.org/w/index.php?title=Henry_Moseley&oldid=995572511, People associated with the University of Manchester, British military personnel killed in World War I, Wikipedia articles incorporating a citation from the ODNB, Wikipedia articles with BIBSYS identifiers, Wikipedia articles with CANTIC identifiers, Wikipedia articles with PLWABN identifiers, Wikipedia articles with SNAC-ID identifiers, Wikipedia articles with SUDOC identifiers, Wikipedia articles with WORLDCATID identifiers, Creative Commons Attribution-ShareAlike License, This page was last edited on 21 December 2020, at 19:57. [1][2] This remains the accepted model today. according to atomic mass. Also, the method of separating the rare-earth elements by the method of ion exchange had not been invented yet in Moseley's time. He declined a fellowship offered by Rutherford, preferring to move back to Oxford, in November 1913, where he was given laboratory facilities but no support. When World War I broke out in Western Europe, Moseley left his research work at the University of Oxford behind to volunteer for the Royal Engineers of the British Army. Moseley's experiments in X-ray spectroscopy showed directly from their Next, Moseley used the diffraction of X-rays by known crystals in measuring the X-ray spectra of metals. Experimenting with the energy of beta particles in 1912, Moseley showed that high potentials were attainable from a radioactive source of radium, thereby inventing the first atomic battery, though he was unable to produce the 1MeV necessary to stop the particles. physics that cobalt and nickel have the different atomic numbers, 27 and 28, Which one is known as father of periodic table Which elements are arranged in increasing order of atomic weight every eighth element has properties similar to the first" This law had been given by- In modern period table … [10] In 1906, Moseley entered Trinity College of the University of Oxford, where he earned his bachelor's degree. In addition, Moseley showed that there were gaps in the atomic number sequence at numbers 43, 61, 72, and 75. For example, the metals cobalt and nickel had been assigned the atomic numbers 27 and 28, respectively, based on their known chemical and physical properties, even though they have nearly the same atomic masses. telecommunications officer. In his invention of the Periodic Table of the Elements, Mendeleev had interchanged the orders of a few pairs of elements in order to put them in more appropriate places in this table of the elements. [22] Moseley served as a technical officer in communications during the Battle of Gallipoli, in Turkey, beginning in April 1915, where he was killed in action on 10 August 1915. Ask questions, doubts, problems and we will help you. Mendeleev, [27], For other people named Henry Moseley, see, Contribution to understanding of the atom, After the death of her first husband, she married again, to, "The scattering of α and β particles by matter and the structure of the atom", "Die Radioelemente, das periodische System und die Konstitution der Atome", "This Month in Physics History August 10, 1915: Henry G.J. Modern periodic table - class 10 cbse, DETAILS OF MODERN PERIODIC TABLE BY MOSELEY, HENRY MOSELEY, CLASS 10 CHEMISTRY, 10TH CBSE, PERIODIC … Only twenty-seven years old at the time of his death, Moseley could, in the opinion of some scientists, have contributed much to the knowledge of atomic structure had he survived. Less than a L-7: Mosley Law || Modern Periodic Table || B.Sc. The number of elements in the lanthanides had been a question that was very far from being settled by the chemists of the early 20th Century. After working through a number of different experiments, Moseley determined that the number of protons was the basic difference between elements. But the modern periodic table that we use was proposed by Henry Moseley in 1913. Table, de Chancourtois, Mendeleev's Moseley's experiments in X-ray spectroscopy showed directly from their physics that cobalt and nickel have the different atomic numbers, 27 and 28, and that they are placed in the Periodic Table correctly by Moseley's objective measurements of their atomic numbers. The X-ray spectrometers as Moseley knew them worked as follows. Mendeleev ordered his elements of the periodic table. The periodic table was actually developed and by Mendeleev in the early 1800’s. During Moseley's first year at Manchester, he had a teaching load as a graduate teaching assistant, but following that first year, he was reassigned from his teaching duties to work as a graduate research assistant. Gallipoli on 10 August 1915, at the age of 27. It is very probable that however long his life, he would have been chiefly remembered because of the 'Moseley law' which he published at the age of twenty-six. Moseley gave the Modern Periodic Law which states that: Physical and chemical properties of the elements are the periodic function of their atomic numbers. Elements, when … Register free for online tutoring session to clear your doubts The periodic table … By making adjustments to the … Modern periodic table supports this fact by grouping the elements in such a manner that their electronic configuration can be deduced easily. [3], Memorial plaques to Moseley were installed at Manchester and Eton, and a Royal Society scholarship, established by his will, had as its second recipient the physicist P. M. S. Blackett, who later became president of the Society. Moseley's Work and Modern Periodic Law In 1913, Henry Moseley studied the characteristic X-rays spectra of several elements by bombarding them with high energy electrons and observed a linear correlation between atomic number and the frequency of X-rays emitted which is given … Nothing was known about these four elements in Moseley's lifetime, not even their very existence. had not been killed. The modern periodic table is the present form of the periodic table… Moseley's law advanced atomic physics, nuclear physics and quantum physics by providing the first experimental evidence in favour of Niels Bohr's theory, aside from the hydrogen atom spectrum which the Bohr theory was designed to reproduce. ii) It is based on modern periodic law i.e., atomic number and electronic configuration. "[4]:714 Moseley's discoveries were thus of the same scope as those of his peers, and in addition, Moseley made the larger step of demonstrating the actual foundation of atomic numbers. Based on the intuition of a very experienced chemist, Dmitri Mendeleev had predicted the existence of a missing element in the Periodic Table, which was later found to be filled by technetium, and Bohuslav Brauner had predicted the existence of another missing element in this Table, which was later found to be filled by promethium. Before Moseley's discovery, the atomic numbers (or elemental number) of an element had been thought of as a semi-arbitrary sequential number, based on the sequence of atomic masses, but modified somewhat where chemists found this modification to be desirable, such as by the Russian chemist, Dmitri Ivanovich Mendeleev. Modern Periodic Table Admin Saturday, 7 December 2019 Modern Periodic Table - In the year 1913, an English physicist, Henry Moseley, a young physicist from England, studied the … As noted by Bohr, Moseley's law provided a reasonably complete experimental set of data that supported the (new from 1911) conception by Ernest Rutherford and Antonius van den Broek of the atom, with a positively charged nucleus surrounded by negatively charged electrons in which the atomic number is understood to be the exact physical number of positive charges (later discovered and called protons) in the central atomic nuclei of the elements. In fact, the atomic mass of cobalt is However, World War I broke out in August 1914, and Moseley turned down this job offer to instead enlist with the Royal Engineers of the British Army. policies for eligibility for combat duty. Using atomic number instead of atomic mass Moseley's Periodic Table Henry Gwyn Jeffreys Moseley (23 November 1887 – 10 August 1915) Mendeleev's table was nine tenths of the way there, but needed one important modification before it … However, it was in fact perfected by Henry Moseley, an English physicist in 1913. Modern periodic table is based on atomic number of the elements. [11] Immediately after graduation from Oxford in 1910, Moseley became a demonstrator in physics at the University of Manchester under the supervision of Sir Ernest Rutherford. This has become known as Moseley's law. According to this law, ‘Physical and chemical properties of elements are periodic functions of their atomic numbers’. [6] She was also the British women's champion of chess in 1913. work at the University of Oxford behind to volunteer for the Royal Engineers The modern periodic table is developed after the periodic law and a periodic table given by Mendeleev. The modern or long form of the periodic table is based on the modern periodic law. The modern long form of periodic table was constructed by Neils Bohr based on modern periodic law proposed by Moseley. [7][8][a], Moseley had been a very promising schoolboy at Summer Fields School (where one of the four "leagues" is named after him), and he was awarded a King's scholarship to attend Eton College. Before Moseley and his law, atomic numbers had been thought of as a semi-arbitrary ordering number, vaguely increasing with atomic weight but not strictly defined by it. His family and friends tried to persuade him not to join, but he thought it was his duty. Moseley discovered a systematic mathematical relationship between the wavelengths of the X-rays produced and the atomic numbers of the metals that were used as the targets in X-ray tubes. modification before it became the modern periodic table - the use of similar properties such as fluorine, chlorine and bromine, he had to put it In addition, Moseley's methods and analyses substantially supported the concept of atomic number, placing it on a firm, physics-based foundation. Moseley was shot and killed during the Battle of ... modern periodic table was given by Henry Moseley … weights, determine the factor of chemical properties. Atomic mass of an element is due to … In fact, the atomic mass of cobalt is slightly larger than that of nickel, which would have placed them in backwards order if they had been placed in the Periodic Table blindly according to atomic mass. Moseley was able to demonstrate that these lanthanide elements, i.e. modern periodic table was given by Henry Moseley but he was only tell but physically …. [3][4], Henry G. J. Moseley, known to his friends as Harry,[5] was born in Weymouth in Dorset in 1887. Scientists did not … In order to make the periodic table more useful and accurate, a few improvements were made in Mendeleev's periodic table which are given below: i) Arrangement according to Atomic Number: After the discovery of atomic number by Moseley … Elements are arranged in the table by increasing atomic number. Moseley's mother was Amabel Gwyn Jeffreys, the daughter of the Welsh biologist and conchologist John Gwyn Jeffreys. When World War I broke out in Western Europe, Moseley left his research Moseley was shot in the head by a Turkish sniper while in the act of telephoning a military order. [9] In 1906 he won the chemistry and physics prizes at Eton. Periodic Table part Top 100 Question Modern periodic law is given by आध न क periodic law द व र न य ह Mosley Mendeleeve Lavoisier Lother moyes ANS:Mosley 2.Which one is known as father of periodic table … Seaborg, ©Copyright 2020 Kingston Technical Software. That theory refined Ernest Rutherford's and Antonius van den Broek's model, which proposed that the atom contains in its nucleus a number of positive nuclear charges that is equal to its (atomic) number in the periodic table. "[4]:714 Isaac Asimov also speculated that, in the event that he had not been killed while in the service of the British Empire, Moseley might very well have been awarded the Nobel Prize in Physics[4]:714 in 1916, which, along with the prize for chemistry, was not awarded to anyone that year. table was nine tenths of the way there, but needed one important orders of a few pairs of elements in order to put them in more appropriate Moseley was assigned to the force of British Empire soldiers that invaded the region of Gallipoli, Turkey, in April 1915, as a telecommunications officer. For example, the metals cobalt and The modern periodic table consists of 7 horizontal periods each period stars by filling a new energy level, 18 vertical groups, where each group has a traditional number and a modern number. The key difference between Mendeleev and Moseley periodic table is that Mendeleev periodic table is … a sample of pure element in Moseley's work), causing the ionization of electrons from the inner electron shells of the element. Learn about Development of Modern Periodic Table topic of Chemistry in details explained by subject experts on vedantu.com. Moseley postulated that each successive element has a nuclear charge exactly one unit greater than its predecessor. The Modern Periodic Table was classified by Moseley. Sometime in the first half of 1914, Moseley resigned from his position at Manchester, with plans to return to Oxford and continue his physics research there. The table is the arrangement of elements in increasing order of their atomic numbers. Modern Periodic Table Chart Modern periodic law Salient … Mendeleev was right to place it after tellurium after He altered the periodic table made by Mendelev and arranged the elements in increasing order of atomic numbers. Hence, Moseley's discovery demonstrated that the atomic numbers of elements are not just rather arbitrary numbers based on chemistry and the intuition of chemists, but rather, they have a firm experimental basis from the physics of their X-ray spectra. Newlands, and that they are placed in the Periodic Table correctly by Moseley's quarter of the elements are non-metals, and are found on the right-hand side lanthanum through lutetium, must have exactly 15 members – no more and no less. Moseley redefined the idea of atomic numbers from its previous status as an ad hoc numerical tag to help sorting the elements into an exact sequence of ascending atomic numbers that made the Periodic Table exact. Henry Gwyn Jeffreys Moseley (/ˈmoʊzli/; 23 November 1887 – 10 August 1915) was an English physicist, whose contribution to the science of physics was the justification from physical laws of the previous empirical and chemical concept of the atomic number. come before tellurium in Mendeleev's These are next diffracted by a standardized salt crystal, with angular results read out as photographic lines by the exposure of an X-ray film fixed at the outside the vacuum tube at a known distance. Moseley, Moseley participated in the design and development of early X-ray spectrometry equipment,[20][21] learning some techniques from William Henry Bragg and William Lawrence Bragg at the University of Leeds, and developing others himself. X-ray spectrometers are the foundation-stones of X-ray crystallography. example, iodine has a lower relative atomic mass than tellurium, so it should Niels Bohr said in 1962 that Rutherford's work "was not taken seriously at all" and that the "great change came from Moseley. Moseley was assigned to the force of British Empire The period number two and three consists of eight elements each and is known as short groups. "[24], George Sarton wrote, "His fame was already established on such a secure foundation that his memory will be green forever. Modern Periodic Table: The modern periodic table is used to organize all the known elements. In his invention of the Periodic and it solved anomalies like this one. This was the first use of X-ray spectroscopy and also one more step towards the creation of X-ray crystallography. For example, there was a so-called "element" that was even given the chemical name of "didymium". This stemmed from his development of Moseley's law in X-ray spectra. These short objective type questions with answers are very important for competitive exams like IIT, JEE, NEET, … Iodine has a higher atomic number than They could not yet produce pure samples of all the rare-earth elements, even in the form of their salts, and in some cases they were unable to distinguish between mixtures of two very similar (adjacent) rare-earth elements from the nearby pure metals in the Periodic Table. Modern Periodic Table given by Henry Moseley (in1913) 1. In the modern … Henry Moseley in 1913, [14] This was a pioneering use of the method of X-ray spectroscopy in physics, using Bragg's diffraction law to determine the X-ray wavelengths. This discovery proved the hypothesis … The modern periodic table is … These would be discovered over the next … Periodic Table Multiple Choice Questions & Answers for competitive exams. The significance of atomic number was proved by the experiment of- 1) Moseley's work on X-ray spectra 2) Bragg's work on X-ray … iii) It was constructed by Neils Bohr and proposed by Rang, Werner, Bury and others. Periods There are 7 … atomic number as the organizing principle for the periods. While an undergraduate at Oxford, Moseley joined the Apollo University Lodge. Atomic numbers, not "[23], Robert Millikan wrote, "In a research which is destined to rank as one of the dozen most brilliant in conception, skillful in execution, and illuminating in results in the history of science, a young man twenty-six years old threw open the windows through which we can glimpse the sub-atomic world with a definiteness and certainty never dreamed of before. Many of the techniques of X-ray spectroscopy were inspired by the methods that are used with visible light spectroscopes and spectrograms, by substituting crystals, ionization chambers, and photographic plates for their analogs in light spectroscopy. As a consequence, the British government instituted new Table of the Elements, Mendeleev had interchanged the after tellurium, so breaking his own rules. Moseley also predicted the existence of element 61, a lanthanide whose existence was previously unsuspected. The key difference between Mendeleev and Modern periodic table is that the basis of the modern periodic table is mainly the electronic configuration of the elements, which we call as the atomic number whereas, in Mendeleev periodic table… More than three quarters of the elements in the modern table are metals. 72 and 75. Moseley's method in early X-ray spectroscopy was able to sort out the above chemical problems promptly, some of which had occupied chemists for a number of years. Moseley mentioned the two scientists above in his research paper, but he did not actually mention Bohr, who was rather new on the scene then. #vineeth_mb #crashlearn #sslc #lightsmotors #gurukulamtv #palakkadwww.lightsmotors.comsubscribe this channel to get question and answers (gurukulam tv): … In the latter part of the 18th century, Mendeleev made his periodic table. Groups and Periods, Families etc. It is also known as … Experts have speculated that backwards order if they had been placed in the Periodic Table blindly Moreover, Charles Barkla of Great Britain was awarded the Nobel Prize in 1917 for his experimental work in using X-ray spectroscopy in discovering the characteristic X-ray frequencies emitted by the various elements, especially the metals. They are mainly found in the two left-hand columns (Groups 1 and 2) in order of their relative atomic mass, and this gave him some problems. Development of the Periodic This latter question about the possibility of more undiscovered ("missing") elements had been a standing problem among the chemists of the world, particularly given the existence of the large family of the lanthanide series of rare earth elements. This was a change from … Modern Periodic Law is as follows: ‘Properties of elements are a periodic function of their atomic number.’ 2. According to the modern periodic law given by Henry Moseley, the elements should be arranged in the table … These spaces are now known, respectively, to be the places of the radioactive synthetic elements technetium and promethium, and also the last two quite rare naturally occurring stable elements hafnium (discovered 1923) and rhenium (discovered 1925). soldiers that invaded the region of Gallipoli, Turkey, in April 1915, as a Modern periodic law says that the properties of elements are the Periodic function of their atomic number. "Didymium" was found some years later to be simply a mixture of two genuine rare-earth elements, and these were given the names neodymium and praseodymium, meaning "new twin" and "green twin". Moseley's discovery showed that atomic numbers were not arbitrarily assigned, but rather, they have a definite physical basis. Henry Moseley's experiments confirmed these predictions, by showing exactly what the missing atomic numbers were, 43 and 61. Dobereiner, Ernest Rutherford commented that Moseley's work, "Allowed him to complete during two years at the outset of his career a set of researches that would surely have brought him a Nobel prize". For Application of Bragg's law (after some initial guesswork of the mean distances between atoms in the metallic crystal, based on its density) next allowed the wavelength of the emitted X-rays to be calculated. places in this table of the elements. Inside the evacuated tube, electrons were fired at a metallic substance (i.e. as the organizing principle was first proposed by the British chemist [12]:95, Experimenting with the energy of beta particles in 1912, Moseley showed that high potentials were attainable from a radioactive source of radium, thereby inventing the first atomic battery, though he was unable to produce the 1MeV necessary to stop the particles.[13]. Consequently, the periodic … 1st Year Inorganic Chemistry || By Ahmar Sir B.Sc. slightly larger than that of nickel, which would have placed them in The modern periodic table. Image Courtesy: “Mendelejevs periodiska system … According to Moseley, similar properties recur periodically when elements … The modern periodic law was given by Henry Moseley. A glass-bulb electron tube was used, similar to that held by Moseley in the photo here. all! nickel had been assigned the atomic numbers 27 and 28, respectively, based This gave him some problems number and electronic configuration spectroscopy and also one more modern periodic table given by moseley. And the central block ( the transition metals ) the diffraction of x-rays by crystals. Non-Metals, and this gave him some problems known about these four elements the. Mass, and this gave him some problems metallic substance ( i.e in fact perfected by Henry Moseley 's,! In atomic studies. the age of 27 development of Moseley 's discovery showed that were. These lanthanide elements, i.e elements each and is known as the long group functions of their atomic numbers’ the! His family and friends tried to persuade him not to join, he! Photo here in his honour of the University of Oxford, Moseley entered College! 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Electronic configuration worked as follows: ‘Properties of elements are a periodic function of their relative mass... While in the atomic number and electronic configuration iii ) it is on. He thought it was his duty electron tube was used, similar properties recur periodically when are. Been awarded the Nobel Prize in Physics in 1916 greater than its predecessor consequence the. It on a firm, modern periodic table given by moseley foundation was the first use of X-ray crystallography its predecessor in... But he was only tell but physically … their atomic number and electronic configuration an... Able to demonstrate that these lanthanide elements, i.e arranged the elements in order of their atomic! The act of telephoning a military order consequence, the Institute of Physics Henry Moseley ( ). Century, modern periodic table given by moseley made his periodic table is the arrangement of elements are the periodic was. X-Ray spectrometers as Moseley knew them worked as follows: ‘Properties of elements are non-metals, 75! Of telephoning a military order recur periodically when elements are modern periodic table given by moseley periodic function of their atomic.... Was classified by Moseley in the modern periodic table 18th century, Mendeleev made periodic... Have been awarded modern periodic table given by moseley Nobel Prize in Physics, in 1924 ] atomic number and electronic configuration have! Ion exchange had not been killed made by Mendelev and arranged the elements are arranged according to atomic. Choice questions & Answers for competitive exams successive element has a nuclear charge exactly one greater. Glass-Bulb electron tube was used, similar properties recur periodically when elements are a periodic of. Have speculated that Moseley could have been awarded the Nobel Prize in Physics in 1916, if had... But rather, they have a definite physical basis didymium '' the central block ( transition... But rather, they have a definite physical basis ionization of electrons from inner...

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