1D.9 nodes

[keyaluo4C]

1D.9 asks for the number of radial nodes and angular nodal surfaces. What is the difference between these two and aren't they the same number?

[Atul Saha 3D]

Angular nodes are planar areas where there is 0 probability of finding electrons, kind of like a flat sheet. Radial nodes are spherical shells where there is 0 probability of finding electrons, like a peel.
The second quantum number ℓ gives the number of angular nodes. The number of radial nodes is given by n - ℓ - 1.

Much Joy,
Atul