1.

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

Answer»

`ns RARR (n - 2) f rarr (n -1)d rarr np`
`ns rarr (n-1)d rarr (n-2)f rarr np`
`ns rarr (n-2)f rarr np rarr (n-1)d`
none of these are correct

Answer :A


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