MDCAT Chemistry MCQ #830

Why is the second ionization energy of sodium significantly higher than its first?

MDCAT Chemistry MCQ #830

  1. Question 1

    Q1. Why is the second ionization energy of sodium significantly higher than its first?

    • A) Removing an electron from a +1 ion requires more energy
    • B) Electron removal from a noble gas core
    • C) Higher effective nuclear charge
    • D) Smaller ionic radius

    Answer: Electron removal from a noble gas core

    Explanation: Na⁺ has a Ne core, which is stable. A and C are indirect consequences.