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JAMB Chemistry 2012 Question 10

Question 10

Atomic Structure

The electronic configuration of Mg2+ is

  1. A.1s22s22p63s23p2
  2. B.1s22s22p63s2
  3. C.1s22s22p6
  4. D.1s22s22p4
Show the answer and explanation

Answer: C (1s22s22p6)

Explanation

Mg (12 electrons) loses its two 3s electrons, leaving 10: 1s22s22p6.