John Dalton, the father of the atomic theory of matter, said that "all atoms of a given chemical element are identical". What is wrong with that statement?
1. He didn't consider Conservation of Mass in reactions
2. The isotopes of an element have different masses
3. The chemical formula of water is H20 not HO
4. The law of definite Proportions may be violated
5. The law of multiple proportions requires multiples of atoms