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JAMB Chemistry 2006 Question 30

Question 30

Atomic Structure

A particle that contains 11 protons, 12 neutrons and 10 electrons is probably a

  1. A.neutral non-metal
  2. B.metallic ion
  3. C.non-metallic ion
  4. D.neutral metal
Show the answer and explanation

Answer: B (metallic ion)

Explanation

11 protons is sodium; having one electron fewer than protons means it is the positive ion Na+, a metallic ion.