my science teacher said ions are created by filling the energy levels in the electron cloud and according to him to fill the fourth energy level of copper you need to add 7 electrons or lose 11 electrons he says there can be 2 electrons in the first level, 8 in the second, 8 in the third, and 18 in the fourth
Coppers ions are both those because it allows coppers ground state electronic configuration to adapt to whatever it wishes to bond to to make it a more stable atom.
