The S-block reference article from the English Wikipedia on 24-Jul-2004
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S-block

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Elemental Groups
Subgroups

Groups 1A (alkali metals) and 2A (alkaline earth metals) of the periodic table, Hydrogen, and helium make up the S-block (for sharp) elements. These elements have noble gas structures.

An s orbital can hold a maximum of 2 electrons.

See also