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Question

If aufbau rule in not followed, the 19th electron of Sc(Z=21) will have:

A
n=3,l=0
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B
n=3,l=0
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C
n=3, l=2
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D
n=4,l=0
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Solution

The correct option is D n=4,l=0
Sc(Z=21)=[Ar]184s23d1,19th electron enters into 4s orbital. For 4s orbital n=4 and l=0

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