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Question

Please follow the Aufbau principle, Pauli exclusion principle and Hund's rule to determine the four quantum numbers (principle, angular, magnetic, spin) for the final electron of Helium.


A
0,0,0,+1/2
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B
1,1,0,1/2
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C
1,0,1,1/2
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D
1,0,0,1/2
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Solution

The correct option is D $$1,0,0,-1/2$$
The electronic configuration of Helium is $$1{ s }^{ 2 }$$. Thus last electron is in $$1s$$. Hence value of $$n=1,l=0,m=0,s=\pm \cfrac { 1 }{ 2 } $$. Thus correct set from given options is $$1,0,0,- \cfrac { 1 }{ 2 } $$ i.e., option D

Chemistry

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