Dalton's atomic theory is useful to explain the structure of an atom. Dalton's explain the atomic structure on the basis of his different postulates. These postulates combine together explains the atom model.
According to Dalton, different atoms has the ability to combine together. The atoms always combine in a whole number ratio to form the compounds. The atoms of the specific element are different from the other element as they have different atomic numbers and different physical and chemical property.
Thus, the correct answer is whole number, different.
