When a Mg2+ ion becomes a Mg atom, the radius increases because the Mg2+ ion(1) gains 2 protons

August 2018 NY Regents Chemistry Exam

38 When a Mg2+ ion becomes a Mg atom, the radius increases because the Mg2+ ion (1) gains 2 protons

(2) gains 2 electrons

(3) loses 2 protons

(4) loses 2 electrons

Solution: Electrons are negative. When Mg2+ ion becomes a Mg atom, it gains two electrons to become neutral.

Answer: 2

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