1.

if n=6, the correct sequence of filling of electrons will be

Answer»

`NS to NP (n-1) d to (n-2) F`
`ns to n (n-2) f to (n-1) d to np`
`ns to (n-1) d to (n-2) f to np`
`ns to (n-2) f to np to (n-1) d`

ANSWER :B


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