MDCAT Chemistry MCQ #952

Which pair of elements shows an exception to the typical electron configuration pattern?

MDCAT Chemistry MCQ #952

  1. Question 1

    Q1. Which pair of elements shows an exception to the typical electron configuration pattern?

    • A) Chromium (Cr) and Copper (Cu)
    • B) Nitrogen (N) and Oxygen (O)
    • C) Sodium (Na) and Magnesium (Mg)
    • D) Boron (B) and Aluminum (Al)

    Answer: Chromium (Cr) and Copper (Cu)

    Explanation: Cr and Cu have half-filled/d filled subshells for stability. Other pairs follow Aufbau without exceptions.