Question

The number of subshells present in the third shell is equal to?

• A. $1$
• B. $3$
• C. $5$
• D. $7$

Answer 1

The correct option is B $3$

We know that,
values of $l=0,\mathrm{1.....},(n-1)$
where, $n$ is principal quantum number and $l$ is azimuthal quantum number
For third shell, $n=3$,
On putting $n=3$, we get,
i.e $l$ = 0, 1, 2

we know,
No. of possible subshells = no. of possible values of $l$.
So, number of subshells = 3.