Changes

A '''chemical''' is either an [[element]] or a [[compound]] of elements. A chemical substance is composed entirely of a set of one or more kinds of atoms, ions or isotopes.

A '''chemical''' is either an [[element]] or a [[compound]] of elements. A chemical substance is composed entirely of a set of one or more kinds of [[atom]]s, [[ion]]s or isotopes.

In comparison, a mixture consists of more than one chemical. For example, a solution is one or more chemicals dissolved in liquid.

In comparison, a mixture consists of more than one chemical. For example, a solution is one or more chemicals dissolved in liquid.