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Question

State the electronic configuration for Nitrogen [p=7, n=7].
  1. 2, 3
  2. 2, 4
  3. 2, 5
  4. 2, 6

A
2, 3
B
2, 6
C
2, 4
D
2, 5
Solution
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As we know, atomic no. is the total no of proton present in nucleus of an atom and atomic mass no is the total no of proton and neutron.
So nitrogen have atomic no. 7 and mass no. 7+7=14. K shell will accommodate 2 electrons and rest will be accommodated in L shell. Therefore, the configuration is 2, 5.

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