Chemistry & Environmental Dictionary

Atomic Number - Azimuthal Quantum Number

Atomic Number

The number of protons in the nucleus of an atom. This determines an element's structure, properties and location on the periodic table of elements.

Atomic Radius

One-half the distance between two adjacent atoms in crystals of elements. This varies according to interatomic forces.

Atomic Volume

The atomic mass of an element divided by its density.

Avogadro, Amadeo (1776-1856)

An Italian chemist who first stated the principle behind stoichiometry in 1811. Also see Avogadro's Number and Molarity, Molality And Normality.

Avogadro's Number

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.

Azimuthal Quantum Number (angular momentum quantum number)

The quantum number that distinguishes orbitals of given n having different shapes. This can be any interger value from 0 to n-1.

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