Question

Which of the following correctly represents the electronic distribution of magnesium atom?

1,8,3

3,8,1

2,8,2

8,2,2



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Answer 1

Answer:

Atomic number of Mg is 12. So, according to Bohr's formula of distribution of electrons (2n

2

), K shell (n=1) can accommodate 2 electrons, L shell (n=2) can accommodate 8 electrons and the rest 2 electrons are accommodated in M shell. So its electronic configuration is 2,8,2. Hence option(c) is correct.