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JAMB Chemistry 2006 Question 35

Question 35

Atomic Structure

The element with the electron configuration 1s22s2 2p3 is

  1. A.calcium
  2. B.chlorine
  3. C.oxygen
  4. D.nitrogen
Show the answer and explanation

Answer: D (nitrogen)

Explanation

Adding up the electrons gives 2 + 2 + 3 = 7, the atomic number of nitrogen.