Chemistry-
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Question

Thelectroniconfiguration of element when jusabovthelement witatominumber 4thsamperiodigrouis:

  1. 1s2 2s2 2p6 3s2 3p6 3d10 4s1 4p6    
  2. 1s2 2s2 2p6 3s2 3p6 3d5 4s1    
  3. 1s2 2s22p63s23p63d54s2    
  4. 1s22s22p63s23p63d104s24p6    

The correct answer is: 1s2 2s22p63s23p63d54s2

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