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A168208
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Irregular table of the number of electrons of the n-th element of the PSE in atomic shells, read by rows.
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7
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1, 2, 2, 1, 2, 2, 2, 3, 2, 4, 2, 5, 2, 6, 2, 7, 2, 8, 2, 8, 1, 2, 8, 2, 2, 8, 3, 2, 8, 4, 2, 8, 5, 2, 8, 6, 2, 8, 7, 2, 8, 8, 2, 8, 8, 1, 2, 8, 8, 2, 2, 8, 9, 2, 2, 8, 10, 2, 2, 8, 11, 2, 2, 8, 13, 1, 2, 8, 13, 2, 2, 8, 14, 2, 2, 8, 15, 2, 2, 8, 16, 2, 2, 8, 18, 1, 2, 8, 18, 2, 2, 8, 18, 3, 2, 8, 18, 4, 2
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OFFSET
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1,2
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COMMENTS
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For the n-th element in the periodic system of elements, row n of the table shows the occupancy of the K-shell, then the L-shell, then the M-shell etc.
Row sums are A000027(n). A093907(c) is the maximum number that may appear in column c.
How are rows defined when the n-th element has more than one possible electron configuration? For example, element no. 28 (Nickel) has two electron configurations, namely 2, 8, 16, 2 and 2, 8, 17, 1, and it is disputed which of them is the ground state configuration of Nickel. - Felix Fröhlich, Jun 02 2019
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LINKS
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EXAMPLE
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Irregular table starts as follows, where Z denotes the atomic number:
Z | Element name | Electrons per shell
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1 | Hydrogen | 1
2 | Helium | 2
3 | Lithium | 2, 1
4 | Beryllium | 2, 2
5 | Boron | 2, 3
6 | Carbon | 2, 4
7 | Nitrogen | 2, 5
8 | Oxygen | 2, 6
9 | Fluorine | 2, 7
10 | Neon | 2, 8
11 | Sodium | 2, 8, 1
12 | Magnesium | 2, 8, 2
13 | Aluminium | 2, 8, 3
14 | Silicon | 2, 8, 4
15 | Phosphorus | 2, 8, 5
16 | Sulfur | 2, 8, 6
17 | Chlorine | 2, 8, 7
18 | Argon | 2, 8, 8
19 | Potassium | 2, 8, 8, 1
20 | Calcium | 2, 8, 8, 2
21 | Scandium | 2, 8, 9, 2
22 | Titanium | 2, 8, 10, 2
23 | Vanadium | 2, 8, 11, 2
24 | Chromium | 2, 8, 13, 1
25 | Manganese | 2, 8, 13, 2
26 | Iron | 2, 8, 14, 2
27 | Cobalt | 2, 8, 15, 2
(End)
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CROSSREFS
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KEYWORD
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nonn,less,tabf
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AUTHOR
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EXTENSIONS
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Redefined as an irregular table by R. J. Mathar, Dec 05 2009
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STATUS
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approved
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