%I #5 Mar 30 2012 17:25:42
%S 4,12,20,38,56,88
%N Atomic numbers of the alkaline earth metals.
%e 12 is the atomic number of magnesium.
%Y Cf. A099955, alkali metals; A101648, metalloids; A101647, nonmetals (except halogens and noble gases); A097478, halogens; A018227, noble gases; A101649, poor metals.
%K nonn,fini,full
%O 1,1
%A _Parthasarathy Nambi_, Nov 12 2004
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