AP Chemistryeasymcq1 pt
Which particle is smaller than the neutral atom from which it was formed?
A.Cl⁻
B.Mg²⁺
C.O²⁻
D.S²⁻
Explanation
Core Concept
Removing electrons reduces repulsion among those that remain while nuclear charge stays fixed, so the cloud contracts; every cation sits below its parent radius. Magnesium losing its two outermost electrons empties the n = 3 shell entirely, an especially large contraction. Anions behave oppositely, swelling beyond their parents as added electrons crowd inward.
Correct Answer
BMg²⁺
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