1) All matter is made of atoms. Atoms are indivisible and indestructible.

2) All atoms of a given element are identical in mass and properties

3) Compounds are formed by a combination of two or more different kinds of atoms.

4) A chemical reaction is a rearrangement of atoms

5) Atoms cannot be created or destroyed. When a compound decomposes, the atoms are recovered unchanged.

Moder atomic theory