Well ask yourself why don't we count it in moles and you should get your answer.
The rocky outer layer of Earth's<span> surface. The two types of </span>crust<span> are continental and oceanic. The layer of solid, </span>brittle<span> rock that makes up the </span>Earth's<span> surface. The lithosphere is composed of the </span>crust<span> and the uppermost mantle</span>
In the context of multivalent ions, it is when it has multiple oxidative states.