How many orbitals are there in the third shell (n=3)?

May 19, 2018

$9$ orbitals

Explanation:

The third electron shell has $3$ subshells, which are $3 s$, $3 p$, and $3 d$.

An $s$ subshell only has one orbital.

A $p$ subshell has three orbitals.

A $d$ subshell has five orbitals.

So, the total number of orbitals in the third electron shell is:

$1 + 3 + 5 = 9$