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JAMB Chemistry 2004 Question 8

Question 8

Atomic Structure

An electron can be added to a halogen atom to form a halide ion with

  1. A.2 valence electrons
  2. B.3 valence electrons
  3. C.7 valence electrons
  4. D.8 valence electrons
Show the answer and explanation

Answer: D (8 valence electrons)

Explanation

A halogen atom has 7 valence electrons; gaining one electron gives the halide ion a full octet of 8.