Question

An electron has principal quantum number $3$. The number of its (i) sub-shells and (ii) orbitals would be respectively

• A. $3$ and $5$
• B. $3$ and $7$
• C. $3$ and $9$
• D. $2$ and $5$

Answer 1

Answer: (C)

The principal quantum number $n=3.$ Then azimuthal quantum number $l=3$ and number of orbitals $=n^2=3^2=$ $9.3$ and $9$.