Question

The relation between the mass number A, atomic number Z, and neutron number N of a nuclide is:

Options

• \[Z = A + N\]

• \[A = Z - N\]

• \[A = Z + N\]

• \[N = A + Z\]

Answer 1

The mass number A is the total number of protons and neutrons (nucleons) in the nucleus. Therefore \[A = Z + N\], where Z is the atomic number (number of protons) and N is the neutron number (number of neutrons).