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JAMB Chemistry 1981 Question 10

Question 10

Atomic Structure

Sodium and potassium belong to the same group of the Periodic Table. This is because

  1. A.both are metals
  2. B.both are soft and lighter than water
  3. C.both form cations by losing electrons
  4. D.both have identical electronic configuration
  5. E.both react with water vigorously
Show the answer and explanation

Answer: D (both have identical electronic configuration)

Explanation

Elements in the same group have the same outer-shell electron arrangement. Sodium (2,8,1) and potassium (2,8,8,1) each have one electron in the outer shell, which is what the option means by 'identical' configuration.