Question

how are the atomic number and mass number related to the number of protons and neutrons

Answer 1

Atomic no =no. Of protons
mass no. =no. Of protons +no. Of neutrons

Answer 2

The mass number (symbol A), also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus.
and the atomic no. (z) is the total no. if protons present in the nucleus of an atom