Question

if you know the mass # and the # of protons, how can you calculate the number of neutrons? take the mass number and subtract the number of protons round the average atomic mass and subtract the number of protons rewatch next question

Explanation:

The mass number of an atom is defined as the sum of the number of protons and neutrons in its nucleus. Rearranging this relationship allows calculation of neutron count.

Answer:

take the mass number and subtract the number of protons