# How many nodal points 3p orbital have?

Jul 6, 2017

Not sure what you mean by points, but the $3 p$ orbital has:

• a principal quantum number $n = 3$, placing it on the third energy level.
• an angular momentum quantum number $l = 1$, giving it the shape of a $p$ orbital.

The number of radial nodes, otherwise known as spherical shell nodes, is given by $n - l - 1$, so there is

$n - l - 1 = 3 - 1 - 1 = \boldsymbol{1}$ radial node

in the $3 p$ orbital (see the green circle in the image above).

The number of angular nodes (or nodal planes, for orbitals that are not the ${d}_{{z}^{2}}$ or ${f}_{{z}^{3}}$), is given by $l$, so there is

$l = \boldsymbol{1}$ angular node (here, nodal plane)

in the $3 p$ orbital (the plane perpendicular to the orbital axis).

Thus, the total number of nodes (regardless of type) is given by

$n - 1 = 3 - 1 = \boldsymbol{2}$ total nodes in general in the $3 p$ orbital.

Nodal planes are depicted more explicitly here: