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JAMB Chemistry 2000 Question 9

Question 9

Atomic Structure

Which of the following statements is correct about the periodic table?

  1. A.Elements in the same period have the same number of valence electrons
  2. B.The valence electrons of the elements in the same period increase progressively across the period
  3. C.Elements in the same group have the same number of electron shells
  4. D.The non-metallic properties of the elements tend to decrease across each period
Show the answer and explanation

Answer: B (The valence electrons of the elements in the same period increase progressively across the period)

Explanation

Across a period one electron is added to the outer shell at each step, so the number of valence electrons rises. Non-metallic character increases, not decreases, across a period.