Question

The number of elliptical orbits excluding circular orbits in the $N$-shell of an atom is:

• A. $3$
• B. $4$
• C. $2$
• D. $1$

Answer 1

The correct option is A $3$

For $n$-shell, $n=4$

Now, for $n=4$, there are $4$ sub shells : $s,p,d$ and $f$ out of these, $s$ is circular. All the others are elliptical.

Hence, $N$ shell has $3$ elliptical orbits.