Average Atomic Mass

Definition

The average atomic mass is the weighted average of all naturally occurring isotopes of an element. It takes into account both the mass and abundance (% occurrence) of each isotope.

Related terms

Weighted Average: An average where each value has a different level of importance or frequency.

Abundance: The relative proportion or quantity of a particular species present in a sample.

Element:

A substance consisting entirely from atoms with the same number of protons.