Two atoms have the same relative atomic mass but different chemical properties. Which row about the proton and neutron numbers of these atoms is correct?

A

Explanation:

Protons are the ones which give rise to different elements, hence different elements have different chemical properties. Therefore, the two atoms must have different proton numbers.

The relative atomic mass of an atom is determined by the mass of the neutrons and the protons. The mass of the electrons are not included due to their negligible mass (1/1840).

Hence, due to the different proton masses, the masses of the neutrons will also differ to ensure that both atoms have the same relative atomic mass.

c) should be the answer.