Explain why 2d and 3f orbitals do not exist.

⇛The value of azimuthal quantum number l decides which type of orbitals(s,p,d or f) would be included in a particular shell. In the case of d and f the values of l are 2 and 3 respectively. Now for n=2,the only possible values of l are 0 and 1. So for the second shell (n=2) d sub-shell cannot exist i.e. there is no existence of d orbital. Similarly when n=3, l will have the values of 0,1,2. Naturally there is no existence of f sub-shell in the Shell number 3; i.e. 3f and 2d orbital will be non-existent...