Magnesium, with a +2 charge.
It's Mg+2
The chemical symbol is Cu2+.
Cl-
According to the periodic table the ion with 28 protons and 30 electrons, the chemical sybol is Ni-58
The symbol for this ion is As3-. The charge is 3- because there are three more electrons than protons.
Co 2+
This ion has 16 protons and 18 electrons.
K
17O2-
It would end up answering with Cobalt = Co. Because the protons stay the same and add the protons and electrons together equaling 59. So (Co+2) would be the final answer.
Ti2- would be the symbol for an ion with 22 protons and 24 electrons. This would be EXTREMELY unlikely to exist though. Ti2+ is more usual with 22 protons and 20 electrons. Ti4+ is even more stable with 22 protons and 18 electrons.
Look at the periodic table. You see that the element that has 16 protons is Sulfur. Electrons have a single negative charge, while protons have a single positive charge, so an ion with 2 more electrons than protons will have a charge of 2-. So, the symbol of the ion would be S2- .
find the difference between the number of electrons and protons, and then find whether protons(+) or electrons(-) are more abundant. if the difference was 2, for example, and there were (2) more protons than electrons, the charge would be written as: chemical symbol 2+