Which of the following correctly represent the electronic distribution in the Mg atom?
  1. 3, 8, 1
  2. 2, 8, 2
  3. 1, 8, 3
  4. 8, 2, 2

AcademicChemistryNCERTClass 9

Correct Answer: (b) 2, 8, 2

Explanation: Atomic number of Mg is 12.

So, according to Bohr\'s formula of distribution of electrons (2n2), the K shell (n=1) can accommodate 2 electrons, the L shell (n=2) can accommodate 8 electrons and the remaining 2 electrons were accommodated in the M shell. Hence, its electronic configuration is 2,8,2.

raja
Updated on 10-Oct-2022 13:32:36

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