MDCAT Chemistry MCQ #780

Which isoelectronic ion has the largest atomic radius?

MDCAT Chemistry MCQ #780

  1. Question 1

    Q1. Which isoelectronic ion has the largest atomic radius?

    • A) O²⁻
    • B) F⁻
    • C) Na⁺
    • D) Al³⁺

    Answer: O²⁻

    Explanation: O²⁻ has the fewest protons, so electrons are least attracted. F⁻ (option B) has more protons, reducing the radius.