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Question

The total number of electrons having m = 0 in potassium atom is


  1. 10

  2. 11

  3. 9

  4. 6


Solution

The correct option is B

11


Electronic configuration of K : 1s2 2s2 2p6 3s2 3p6 4s1

For all ‘s’ electrons m = 0 (7 e)

For 2 electrons each of ‘p’ subshell m = 0 (4 e) Total = 11 e

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