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S-blockGroups 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: See Electron shell, Orbitals
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "S-block".