MDCAT Chemistry MCQ #724

Considering the extra stability of half-filled subshells, what is the ground state electronic configuration of a Chromium (Z=24) atom?

MDCAT Chemistry MCQ #724

  1. Question 1

    Q1. Considering the extra stability of half-filled subshells, what is the ground state electronic configuration of a Chromium (Z=24) atom?

    • A) [Ar] 4s2 3d4
    • B) [Ar] 4s1 3d5
    • C) [Ar] 4s0 3d6
    • D) [Ar] 3d6

    Answer: [Ar] 4s1 3d5

    Explanation: Chromium adopts a 4s1 3d5 configuration for extra stability; 4s2 3d4 is the expected but incorrect ground state configuration.