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Rules for Calculating Protons, Neutrons, Electrons, Atomic Number and Atomic Mass The ATOMIC NUMBER, PROTONS, and ELECTRONS are always the same. EX) If the atomic number of an atom is 15, then the number of protons is 15 and the number of electrons is 15. To calculate the number of NEUTRONS in an atom, you take the ATOMIC NUMBER and SUBTRACT is from the ROUNDED ATOMIC MASS to the nearest whole number. EX) The atomic number for Zinc is 30 and the atomic mass is 65.39. So…you round the atomic mass to 65 and subtract atomic number 30 for it. 65 atomic mass – 30 atomic number = 35 NEUTRONS. To calculate the ATOMIC MASS of an atom you take the number of PROTONS and ADD that to the number of NEUTRONS. EX) 6 NEUTRONS + 5 PROTONS = AN ATOMIC MASS OF 11 (amu)