MDCAT Chemistry MCQ #786

An atom's electron configuration defies the Aufbau principle for stability. Which metal exhibits this?

MDCAT Chemistry MCQ #786

  1. Question 1

    Q1. An atom's electron configuration defies the Aufbau principle for stability. Which metal exhibits this?

    • A) Copper
    • B) Iron
    • C) Nickel
    • D) Zinc

    Answer: Copper

    Explanation: Copper's [Ar]3d¹⁰4s¹ (option A) is more stable than the predicted [Ar]3d⁹4s². Iron (option B) follows Aufbau.