MDCAT Chemistry MCQ #856

Why do isoelectronic ions like O²⁻ and F⁻ show different ionic radii?

MDCAT Chemistry MCQ #856

  1. Question 1

    Q1. Why do isoelectronic ions like O²⁻ and F⁻ show different ionic radii?

    • A) Different number of protons
    • B) Varying number of valence electrons
    • C) Unequal shielding effects
    • D) Differences in electron spin

    Answer: Different number of protons

    Explanation: More protons in F⁻ pull electrons closer than in O²⁻, resulting in smaller radius despite same electrons.