MDCAT Chemistry MCQ #843

Which element's first ionization energy is lower than expected due to its electron configuration in the p-orbital?

MDCAT Chemistry MCQ #843

  1. Question 1

    Q1. Which element's first ionization energy is lower than expected due to its electron configuration in the p-orbital?

    • A) Boron
    • B) Beryllium
    • C) Magnesium
    • D) Aluminum

    Answer: Boron

    Explanation: Boron's IE drops as the first p-electron is added. Beryllium's filled s-orbital has higher IE.