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Answer 1 · 2017-01-15T22:24:27

There are 11 nodal planes in the third shell.

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 $n = 3$ $n = 3$ .

The $3s$ $"3s"$ subshell

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A $3s$ $"3s"$ orbital has two spherical nodal surfaces, but it has no nodal planes.

The $3p$ $"3p"$ subshell

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Each of the three $3p$ $"3p"$ orbitals has a nodal plane perpendicular to its main axis.

The $3d$ $"3d"$ subshell

(From 2012 Book Archive)

Four of the $3d$ $"3d"$ 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.