How many sub-shell are there in N shell? How many orbitals are there in d sub-shell?

Answer

For `N` shell, principal quantum number, `n=4`
Number of sub-shell, in an energy level `=n`
`therefore` Number of sub-shells, in `N` shell `=4`
For `d` subshell `I=2`
Number of orbitals in a sub-shell `=2l+1`
Number of orbitals in a d-sub-shell `=2xx2+1=5`