When an atom is charged, it is called an ion. How many electrons are in O^2-?

A nitride ion has 7 protons, 8 neutrons, and 10 electrons. what is the overall charge on this ion?

When electrons are removed from the outermost shell of a calcium atom, the atom becomes?

An atom that gains or loses an electron has a net electric charge and is called a/n.

Atoms with the same number of protons but with different electrical charges are ____.