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Search: id:A134982
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| A134982 |
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Number of elements in the n-th column of Medeleiev's periodic system of elements. |
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+0
2
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| 7, 6, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 4, 4, 4, 4, 4, 4, 4, 4, 4, 6, 6, 6, 6, 6, 7
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OFFSET
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1,1
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COMMENT
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a(1)=7 represents Hydrogen and the alkali metals. Ends with a(32)=7 for 7 noble gases. These are the block counts (grouping) of the atomic numbers A134984. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 08 2008
The corresponding row numbers are A093907; the sum over all a(n) equals 118 in both cases. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 08 2008
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CROSSREFS
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Cf. A134984, A093907.
Adjacent sequences: A134979 A134980 A134981 this_sequence A134983 A134984 A134985
Sequence in context: A013675 A132714 A105419 this_sequence A064533 A021933 A131266
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KEYWORD
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nonn,fini
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Feb 05 2008
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EXTENSIONS
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Edited by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 08 2008
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