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General
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Question

1s2 2s2 2p5 3s2 shown configuration of:

  1. Al+3 igrounstate    
  2. Ne in excited state    
  3. Mg+1 in excited state    
  4. None of these    

The correct answer is: Mg+1 in excited state

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For the structure given below the site marked as S is a :

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