WILL GIVE BRAINLEST Which of the following are atomic ions? Select all that apply. Cl- Ca2+ K2O O2-

Cl-

Ca2+

Explanation:

An ion is a charged atom or group of atoms. An ion may be formed from an atom or from a molecule.

When an ion is formed from an atom, the atom now has either an excess or an insufficient number of electrons. This will lead to the development of a negative or positive charge in the atom as the case may be.

Cl- and Ca2+ are two ions formed from atoms, the first one has an excess of one electron while the other have lost two electrons