Matter is anything that takes up space and has mass.

All matter is made of atoms

An Atom is the smallest unit of a chemical element.

In each element there are about 120 elements.

Each element is made of only one atom.

The Periodic Table shows all the elements by their properties, and organized categories.

A molecule is when 2 or more atoms are joined together.

Those 2 or more atoms don’t have to be the same.

A Compound is when 2 or more different atoms are joined together.

All compounds are also molecules, but not all molecules are compounds.