Write the formula for the orbital radius of the electron in the atom based on the Bohr atomic model.

(N/A) According to the Bohr atomic model, the radius of the $n^{th}$ orbit of an electron in a hydrogen-like atom is given by the formula:
$r_n = \frac{n^2 h^2 \epsilon_0}{\pi m Z e^2}$
Where:
$n$ is the principal quantum number (orbit number),
$h$ is Planck's constant,
$\epsilon_0$ is the permittivity of free space,
$m$ is the mass of the electron,
$Z$ is the atomic number,
$e$ is the elementary charge.