MDCAT Chemistry MCQ #826

Why does the 4s orbital lose electrons before the 3d in transition metals?

MDCAT Chemistry MCQ #826

  1. Question 1

    Q1. Why does the 4s orbital lose electrons before the 3d in transition metals?

    • A) 4s electrons are higher in energy when 3d is filled
    • B) Stronger shielding of 3d electrons
    • C) Greater penetration of 4s electrons
    • D) Lower effective nuclear charge

    Answer: 4s electrons are higher in energy when 3d is filled

    Explanation: 4s becomes higher in energy after 3d filling. C and D are general orbital properties.