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 Scandium.

A
3,2,2,+1/2
B
5,1,0,1/2
C
4,0,0,1/2
D
4,1,1,1/2

Solution

The correct option is C $$3,2,-2,+1/2$$Scandium has electronic configuration of $$[Ar]4s^23d^1$$ thus last electron belongs to $$3d$$ orbital for which $$n=3,l=2,m_l=-2,-1,0,1,2\ (any\ one),m_s=1/2\ or\ -1/2$$thus option A is correctChemistry

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