# Question 5e8b7

Jan 15, 2017

There are 11 nodal planes in the third shell.

#### Explanation:

A nodal plane is a plane on which the probability of finding an electron is zero.

The third shell consists of all orbitals with principal quantum number $n = 3$.

The $\text{3s}$ subshell

A $\text{3s}$ orbital has two spherical nodal surfaces, but it has no nodal planes.

The $\text{3p}$ subshell

Each of the three $\text{3p}$ orbitals has a nodal plane perpendicular to its main axis.

The $\text{3d}$ subshell

(From 2012 Book Archive)

Four of the $\text{3d}$ orbitals have two nodal planes each.

The "3d"_z²# orbital has two conical planes but no nodal plane.

Thus, there are 11 nodal planes in the third shell.