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
B
1,1,0,1/2
C
1,0,1,1/2
D
1,0,0,1/2

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 DChemistry

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