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13 August, 12:07

Magnesium (Mg) has an atomic number of 12. What is the ground-state electron configuration of magnesium?

A. 1s21p62s22p2

B. 1s21p61d4

C. 1s22s22p63s2

D. 1s22s22p62d2

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Answers (2)
  1. 13 August, 12:40
    0
    C. 12222632

    You have to follow the Aufbau principle, which states that electrons populate the atomic orbitals situated at the lowest energy first.

    The orbitals are:

    1

    22

    333

    4444

    5555

    666

    77
  2. 13 August, 13:23
    0
    The answer is 1s22s22p63s2
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