Which describes an atom that has fewer neutrons than protons and more electrons than protons?

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.

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

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