OFFSET
1,1
COMMENTS
After the s-block (A160914) and the p-block (A138469), we present the d-block (4*10) elements for the Janet table, in A167268. Janet published his table in a 1928 book (see below), 24 of planche 7, in which he also introduced the s, p, d, f blocks (called nappes 1, 2, 3, 4).
a(n) also comes from one of the two classical Mendeleyev-Moseley-Seaborg periodic table(s) i.e. (see A138096):
1 2
3 4 5 to 10
11 12 13 to 18
19 20 21 to 30 31 to 36
37 38 39 to 48 49 to 54
55 56 57 to 70 71 to 80 81 to 86
87 88 89 to 102 103 to 112 113 to 118.
(The second is in A134982).
REFERENCES
Charles Janet, Essais de classification hélicoidale des éléments chimiques, April 1928, N3, Beauvais, 2 + 104 pages, 4 leaflets (4 to 7).
LINKS
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Paul Curtz, Nov 12 2011
STATUS
approved