S-block
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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 Electron shell, Orbitals
References
- Adapted from the Wikipedia article, "S-block" http://en.wikipedia.org/wiki/S-block, used under the GNU Free Documentation License
