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%I #36 Jan 25 2020 08:01:16
%S 8,6,7,9,5,6,8,6,8,4,6,9,9,7,10,6,8,5,9,7,8,8,8,8,9,4,6,6,6,4,7,9,7,8,
%T 7,7,8,9,7,9,7,10,10,9,7,9,6,7,6,3,8,9,6,5,7,6,9,6,12,9,10,8,8,10,7,
%U 10,7,6,7,9,8,7,8,8,7,6,7,8,4,7,8,4,7,8,8,5,8,6,8,7,12,7,9,9,9,6,9,11,11,7,11,8,10,13,7,10,7,7,10,12,11,11,8,9,9,11,10,9
%N Number of letters in the English name of the n-th element in the periodic table of the elements.
%C The names are based on the IUPAC Inorganic Chemistry Division table.
%C The sequence appears to be not very well defined, concerning the terms (names can change) and number of terms (in June/November 2016 four new names were given to elements number 113, 115, 117 and 118). - _M. F. Hasler_, Jan 24 2020
%C The names my change, certainly, but at any given time the sequence is defined by the names in the IUPAC Inorganic Chemistry Division table. - _N. J. A. Sloane_, Jan 25 2020
%H International Union of Pure and Applied Chemistry, <a href="https://iupac.org/what-we-do/periodic-table-of-elements/">Periodic Table of Elements</a>
%H Herbert Kaesz, <a href="http://www.iupac.org/publications/ci/2002/2402/elements110.html">The synthesis and naming of elements 110 and beyond</a> Chemistry International 24:2 (2002), p. 7.
%H W. H. Koppenol, <a href="http://iupac.org/publications/pac/74/5/0787/">Naming of new elements</a>, Pure and Applied Chemistry 74:5 (2002), pp. 787-791.
%H Wikipedia, <a href="http://en.wikipedia.org/wiki/Periodic_table">Periodic table</a>
%e a(1) = 8, because HYDROGEN uses 8 letters.
%e a(2) = 6, because HELIUM uses 6 letters.
%e a(3) = 7, because LITHIUM uses 7 letters.
%e and so on. Note that a(13) = 9, not 8, since the IUPAC spellings are used.
%t Length @ Characters @ ElementData[#, "Name"] & /@ Range[118] (* _Amiram Eldar_, Jan 25 2020, generates all the terms in the data section with two exceptions: a(13) assumes the name "Aluminum" instead of "Aluminium" and a(55) assumes the name "Cesium" instead of "Caesium" *)
%Y See A007656 for the atomic weights.
%Y Cf. A005589 (letters in name of n), A070273 (letters in names of the planets), A031139 (letters in names of months), A309750 (variant: in alphabetical order).
%K nonn,fini,easy,word
%O 1,1
%A _Kausthub Gudipati_, Jun 30 2011
%E a(7), a(32), a(35) corrected and a(51)-a(118) added by _Andrew Howroyd_, Jan 24 2020
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