1.

For principal quantum number n = 4, the total number of orbitals having l = 3 is

Answer»

3
7
5
9

Solution :When `n = 4, l = 0, 1, 2, 3`, i.e., 4s, 4P, 4D 4f subshells. But `l = 3` is only for f-subshell which has 7 orbitals.


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