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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