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JAMB Chemistry 1988 Question 9

Question 9

Atomic Structure

A metallic ion X2+ with an inert gas structure contains 18 electrons. How many protons are there in this ion?

  1. A.20
  2. B.18
  3. C.16
  4. D.2
Show the answer and explanation

Answer: A (20)

Explanation

X2+ has lost 2 electrons, so the neutral atom had 20 electrons and therefore 20 protons (calcium).