Z(Atomic number) IS the number of protons in a nucleus.
The number of metals is more than twice the number of nonmetals.
the mass number is number of protons in an atom, plus the number of neutrons.
The atomic number of an atom is its number of protons. For instance, a hydrogen atom has an atomic number of one, meaning there is one proton in one hydrogen atom. Also, as there are the same number...
the atomic number does not tell you the neutrons it only tells you the protons and the electrons