Question

The mass number of a nucleus (except Hydrogen) is:


always less than its atomic number
never less than its atomic number
sometimes equal to its atomic number
sometimes less than and sometimes more than its atomic number

Answer 1

The atomic mass always greater than atomic number.

The atomic number is equal to the number of protons in the nucleus, whereas the atomic mass depends on the sum of the mass of the protons and the neutrons. Almost every type of atom has both protons and neutrons, there's an exception is the hydrogen isotope, which consists of one proton with one electron.

Answer 2

Thanks!