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JAMB Chemistry 1998 Question 10

Question 10

Atomic Structure

Which of the following electron configurations indicates an atom with the highest ionization energy?

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

Answer: A (2, 8, 7)

Explanation

Ionization energy is highest for a small atom with a nearly full outer shell. 2, 8, 7 (chlorine) has fewer shells than 2, 8, 8, 7, so its outer electrons are held most tightly; the 1- and 2-electron metals lose electrons easily.