All atoms and molecules have mass and therefore

Explanation:

All the atoms and molecules have mass and therefore they occupy volume. Hence, they are considered as matter.

Basically, a substance that has mass and take up space is known as matter.

For example, table, chair, pen, paper, car, wooden box etc are all matter.

A matter can be in solid, liquid or gaseous state.

Hence, we can conclude that all atoms and molecules have mass and therefore occupy space and known as matter.