Question

The major difference between oxygen and ozone is:

1.the number of atoms in a molecule
2.the kind of atoms they are made of
3.the color of the gas
4..one is a gas and the other is a liquid

Answer 1

Answer is number 1
Oxygen O2
Ozone O3

Answer 2

The answer is the first one.
Ozone has 3 oxygen atoms whilst oxygen is made from 2 oxygen atoms