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JAMB Chemistry 2007 Question 30

Question 30

Atomic Structure

If the electron configuration of an element is 1s22s22p5, how many unpaired electrons are there?

  1. A.2
  2. B.5
  3. C.1
  4. D.4.
Show the answer and explanation

Answer: C (1)

Explanation

Five electrons in the three 2p orbitals fill them as ↑↓, ↑↓, ↑, leaving one unpaired electron.