Question

How Many Radial Nodes Are Present In $4s$ Orbital ?

Answer 1

The number of radial nodes in $4\mathrm{s}$ orbital is explained below:

No. of radial nodes $=\mathrm{n}-\mathrm{l}-1$

where, $\mathrm{n}=$Principal quantum number

$\mathrm{l}=$azimuthal quantum number

1. For $4\mathrm{s}$ orbital, $$\begin{gathered} \mathrm{n}=4 \\ \mathrm{l}=0 \end{gathered}$$
2. No. of radial nodes for $4\mathrm{s}$ orbital $$\begin{gathered} =4-0-1 \\ =3 \end{gathered}$$

There are $3$ radial nodes in $4\mathrm{s}$ orbitals.