MDCAT Chemistry MCQ #1737

The first ionization energy of Sodium is 496 kJ/mol, but the second ionization energy jumps to 4562 kJ/mol because:

MDCAT Chemistry MCQ #1737

  1. Question 1

    Q1. The first ionization energy of Sodium is 496 kJ/mol, but the second ionization energy jumps to 4562 kJ/mol because:

    • A) The second electron is a valence electron
    • B) The electron is removed from a stable inner shell
    • C) The nuclear charge decreases after the first ionization
    • D) Shielding effect increases significantly

    Answer: The electron is removed from a stable inner shell

    Explanation: Removing an electron from a stable neon-like core requires massive energy. Option A fails as it describes the easier first ionization process.