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Protons, Neutrons, and Electrons Practice Worksheet Use the periodic table to find the numbers of protons, neutrons, and electrons for atoms of the following elements. Name of Element Element Symbol Mass Number Atomic Number Protons Neutrons Electrons Boron B 11 5 5 6 5 24 11 31 37 Sodium Gallium Y 89 Copper 39 29 Tc 98 Pb 207 35 43 Ytterbium 103 Ac 227 89 Mo Thallium 54 204 Fm No 81 100 157 259 H Carbon 70 0 12 N 7 Ba 56 2 2 Calcium Si Argon 14 18 Mg 12 106 12 159