Question

Is 3f sub shell is allowed in an atom ?justify your answer

Answer 1

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Electronic configuration is given as :-

1s2 ,

2s2, 2p6

3s2 , 3p6 , 3d10

4s2 , 4p6, 4d10 , 4f14

5s2, 5p6 , 5d10 , 5f14

SO ..........

3f subshell is not allowed I mean it isn't there .

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