An atom of silicon has a mass number of 28 and an atomic number of 14. How can you determine how many protons and how many neutrons are in this atom?

So the question ask to determine or what are the ways in determining how many neutrons and how many protons that is present in an atom of silicon that has a mass number of 28 and an atomic number of 14, base on that, I would say that the atomic number is the number of protons in an atom while the number of neutron is computed by subtracting atomic number and the mass number.