Determine the electronic configurations, Chemistry

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Aufbau principle is obeyed in which of the following electronic configurations:

(1) 1s2 2s2 2p6                  

(2)  1s2 3p6 3s2    

(3)  1s2 3s2 3p6                              

(4) 1s2 2s2 3s2

ans: 1s2 2s2 2p6

 


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