Question

Help Please which one is the right one?
an ion of tin-122 with a charge of +2 would have which of the following?
50 proton 50 electrons and 72 neutrons
50 proton 50 electrons and 50 neutrons
50 proton 48 electrons and 72 neutrons
50 proton 52 electrons and 72 neutrons
50 proton 48 electrons and 70 neutrons

Answer 1

50 proton 48 electrons and 72 neutrons

Answer 2

122 - 50 (atomic #) = 72 neutrons. We know that it has 50 protons b/c of the atomic number, and also that means 50 electrons in a neutral atom. Since it is a cation with a 2+ charge, it's means 2 electrons were taken away, causing a charge.