Which of the following orbital are and possible ?
`2d,Delta f ,4g and 6 d`

Explanation

`2d` is not posible : For d sub-shell `1= 2` when `n = 2 ,l cm ` be equal to `0 `and `1` hence `l` cannot be `2 ` for `n = 2` so that `2d` sub-shell is not possible.
`4f` is possible for f sub-shell `l =- 3` where `n = 4 , l am` be equal to `3`
`4g` is not possible : for g sub-shell `l = 4` when` n = 4,l` cannot be equal to `4`
`6d` is posible :For s sub-shell `l= 2` when `n = 6,1 cm `can be equal to `2`