To figure out the number of nertrons, find the atomic mass (should be some long decimal, just round it to the closest whole number to eliminate decimals). Subtract the atomic number FROM the estimated (rounded) atomic mass to get number of neutrons. Example: Carbon has 6 protons & 6 electrons. To get the number of neutrons, look at the atomic mass (12.999 or something, idk). Round it to 13 and subtract 13 minus 6 and you get 7. Seven neutrons, six protons, and six electrons in the element carbon. Easy.

Z = Atomic # = #Protons (TOP)

A= Mass # (BOTTOM)

A = (# of protons) +( # of neutrons)

#Neutrons = 28

Atomic # = Z = 24

28+24 = 52

A-Z = #Neutrons

52-24 = 28