%I #2 Mar 30 2012 18:41:15
%S 1,2,1,2,3,4,5,6,7,8,1,2,3,4,5,6,7,8,1,2,2,2,2,1,2,2,2,2,1,2,3,4,5,6,
%T 7,8,1,2,2,2,1,1,2,1,1,10,1,2,3,4,5,6,7,8,1,2,2,2,2,2,2,2,2,2,2,2,2,2,
%U 2,2,2,2,2,2,2,2,2,1,1,2,3,4,5,6,7,8,1,2,2,2,2,2,2,2,2,2,2,2
%N Number of electrons in outermost electron shell (valence electrons) in chemical element number n.
%H C. Heilman, <a href="http://chemlab.pc.maricopa.edu/periodic/periodic.html">The Pictorial Periodic Table</a>
%e Example: element 46Pd has ten electrons in its N-shell, none in its O-shell.
%Y Cf. A080916.
%K nonn
%O 0,2
%A _Ralf Stephan_, Feb 23 2003
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