S-block

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.

Other Blocks:

   * d-block
   * f-block
   * g-block
   * p-block

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