• # question_answer An electron has principal quantum number 3. The number of its (i) sub-shells and (ii) orbitals would be respectively [MP PET 1997] A)                 3 and 5  B)                 3 and 7 C)                 3 and 9  D)                 2 and 5

The principle quantum number $n=3$. Then azimuthal quantum number $l=3$ and number of orbitals $={{n}^{2}}={{3}^{2}}=9$. 3 and 9