How is the angular node determined? State the number of angular nodes for $s, p, d,$ and $f$ orbitals.

(N/A) The number of angular nodes is determined by the azimuthal quantum number,$l$.
For $s$ orbital: $l = 0$,therefore $0$ angular node.
For $p$ orbital: $l = 1$,therefore $1$ angular node.
For $d$ orbital: $l = 2$,therefore $2$ angular nodes.
For $f$ orbital: $l = 3$,therefore $3$ angular nodes.