A compound is a pure substance which consists of two or more different atoms chemical combined (bonded together).

What does a compound look like? A compound could look like or it could look like . There are two different (as indicated by the size and the color) atoms in each representation.

A compound should not be confused with a mixture of two or more elements, because in a compound the atoms of the different elements are chemically combined (bonded together) to form a new substances with physical and chemcial properties completely different from the component atoms.