Answer:
Atomic number is the number of an atoms protons.
Explanation:
Atomic number is the number of protons of an atom. That is to say that if an atom has six protons, (for example a carbon atom) the atomic number of that atom is six. The protons of that atom are always the same: carbon always has six protons. However, the neutron numbers of an element can vary, producing isotopes. Isotopes are atoms of the same element with different amount of neutrons. Apart from that, the number of electrons of an atom can also vary, producing what's called ions.
