engineering chemistry MCQ #963

The atomic number of an element with the electronic configuration 1s² 2s² 2p⁶ 3s² 3p⁶ is

engineering chemistry MCQ #963

  1. Question 1

    Q1. The atomic number of an element with the electronic configuration 1s² 2s² 2p⁶ 3s² 3p⁶ is

    • A) 18
    • B) 20
    • C) 19
    • D) 17

    Answer: 18

    Explanation: The total number of electrons is 2 + 2 + 6 + 2 + 6 = 18, hence the atomic number is 18.