Which of the following is not part of the Atomic Theory?

1. Compounds are made up of combinations of atoms
2. All atoms of a given element are alike
3. All matter is composed of atoms
4. The atom is mainly empty space

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 rearrangementof atoms

Hence correct answer is option D