3f is incorrect.
In 3 f, 3 is principal quantum number.
Azimuthal quantum numbers and corresponding orbitals are given below.
0 -- s
1 -- p
2 -- d
3 -- f
Azimuthal quantum number will always be less than principal quantum number.
So azimuthal and principal quantum number cannot be equal.
In 3 f , they are equal. So it is not acceptable.
(4f, 5f etc are acceptable, not 3f,2f or 1f ::: for clarification)
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