Question 4 • *26-27 CFISD TX-Chemistry A CR
A chlorine ion (Cl⁻) and a phosphide ion (P³⁻) each have 18 electrons. Cl⁻ has 17 protons, while P³⁻ has 15, so Cl⁻ pulls its electrons more strongly and has the smaller radius. The correct choice is smaller.
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