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Unilorin Post-UTME Chemistry 2021 (Model questions) Question 6

Question 6

Atomic Structure

An element X has electronic configuration 1s22s22p63s23p64s2. To which group of the periodic table does X belong?

  1. A.I
  2. B.II
  3. C.III
  4. D.IV
Show the answer and explanation

Answer: B (II)

Explanation

X is 2, 8, 8, 2: two electrons in the outermost shell, so it is in group II (it is calcium).