MDCAT Chemistry MCQ #785

Why does the second ionization energy of sodium spike significantly?

MDCAT Chemistry MCQ #785

  1. Question 1

    Q1. Why does the second ionization energy of sodium spike significantly?

    • A) Removing an electron from a noble gas core
    • B) Increased electron-electron repulsion
    • C) Reduced shielding by inner electrons
    • D) Formation of a half-filled orbital

    Answer: Removing an electron from a noble gas core

    Explanation: Sodium's second IE removes an electron from a neon core (option A), which is highly stable. Repulsion (option B) does not explain the spike.