Answer
Row one: 15 protons, 16 neutrons, 18 electrons, 3- charge.
Row two: Symbol: 79 Se 2-, 36 electrons.
Row three: Symbol: 119 Sn 4+, 4+ charge.
Row four: Symbol: 197 Au 3+, 79 protons.
Work Step by Step
Calculate mass number in symbol by adding protons and neutrons, proton number translates to atomic number on periodic table which gives you the element, net charge is positive if there are more protons than electrons and negative if there are more electrons than protons.
