Atomic weight

The weighted average mass of the atoms in a naturally occurring element.

The terms mass and weight are used interchangeably in this case. The atomic weight given on the periodic table is a weighted average of isotopic masses found in a typical terrestrial sample of the element.

See also: Atom, Atomic Mass Unit, Atomic Number, Molecular Weight.

Previous PageView links to and from this pageNext Page

Subjects: Chemistry Nuclear and Particle Physics