MDCAT Chemistry MCQ #842

Why does the ionic radius of Al³+ fall between Mg²+ and Na+ despite its position in the periodic table?

MDCAT Chemistry MCQ #842

  1. Question 1

    Q1. Why does the ionic radius of Al³+ fall between Mg²+ and Na+ despite its position in the periodic table?

    • A) Higher nuclear charge
    • B) Lower electron affinity
    • C) Electron configuration with p-orbitals
    • D) Anomalous charge density

    Answer: Higher nuclear charge

    Explanation: Al³+ has higher charge than Mg²+ and Na+, pulling electrons closer. Electron configuration and charge density are unrelated.