Question

2 fill in the blank to complete the sentence. not all answer choices will be used. ions form when atoms gain or lose protons electrons neutrons

Explanation:

Atoms form ions by gaining or losing electrons. Protons are in the nucleus and not easily lost or gained in ion - formation (except in nuclear reactions). Neutrons have no charge and their gain or loss does not directly form ions (it forms isotopes). Electrons are in the outer shells and can be transferred to form charged ions. For example, a sodium atom (Na) loses one electron to form a sodium ion \(Na^{+}\), and a chlorine atom (Cl) gains one electron to form a chloride ion \(Cl^{-}\).

Answer:

electrons