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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.

Other Blocks:

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

See Electron shell, Orbitals

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