- The number (6.022×10^23) of atoms, molecules or particles found in exactly 1 mole of substance.
- This is the number of atoms in a 12g sample of carbon-12 (C12). This is equal to 6.0221367E23 atoms. It is named for Italian chemist Amadeo Avogadro (1776-1856) who first stated the principle in 1811.
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