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JAMB Chemistry 2001 Question 5

Question 5

Atomic Structure

A particle that contains 9 protons, 10 neutrons and 10 electrons is a

  1. A.negative ion
  2. B.positive ion
  3. C.neutral atom of a non-metal
  4. D.neutral atom of a metal.
Show the answer and explanation

Answer: A (negative ion)

Explanation

It has one more electron (10) than protons (9), so it carries a charge of −1: a negative ion (F−).