Step-by-step 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.