Samuel de Champlain
The block S is consisted of the elements present in columns 1 (alkaline metals) and 2 (alkaline-earth metals) of the periodic Tableau of the elements, as well as Hydrogène and Hélium.
The elements of the block S have a electronic Configuration layer of valence of the s1 type or S ²: that siginifie that them orbital highest (in energy) occupied is of type S (sharp).
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