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ICSE Class 9 Chemistry Question 3 of 24

Model Question Paper — 2 — Question 6

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6
Question

Question 1(vi)

The atomic numbers of elements A, B, C and D are 2, 6, 12 and 20 respectively. Which of them has 2 electrons in its N shell?

  1. A
  2. D
  3. B
  4. C
Answer

D

Reason — The electronic configuration of D[20] = [2,8,8,2]. Hence, it has 2 electrons in its N shell.