42. How would you determine the electron number if your were given mass and neutron number?
Mass is the total of the protons and neutrons. Subtract the neutrons from the mass and you have the proton number. The number of protons equals the number of electrons. For example, carbon weight (mass) is 12 and the nuetron number is six, subtract 6 from 12 and the answer is 6. Six protons are balanced by six electrons. Proton and electrons are always the same number. The answer is then six.