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Unilorin Post-UTME Chemistry 2021 (Model questions) Question 7

Question 7

Periodic Table

Which of the following sets of elements is arranged in order of increasing first ionization energies?

  1. A.11Na, 3Li, 19K, 37Rb
  2. B.37Rb, 19K, 3Li, 11Na
  3. C.3Li, 19K, 11Na, 37Rb
  4. D.37Rb, 19K, 11Na, 3Li
Show the answer and explanation

Answer: D (37Rb, 19K, 11Na, 3Li)

Explanation

Ionization energy falls down a group, so going up group I from Rb to Li it increases: Rb, K, Na, Li.