Calculation: hxOPfK - 1

r =

4* π

* ε0* n^²* ℏ

/ ( m* e^²)

r =

4* π

* ε0* n^²* ℏ

/ ( m* e^²)

$r$ = $\frac{4\cdot \pi\cdot \varepsilon0\cdot n^{2}\cdot \hbar}{m\cdot e^{2}}$

r =

4* n^²* ε0* π

* ℏ

/ e^²/ m

$r$ = $\frac{4\cdot n^{2}\cdot \varepsilon0\cdot \pi\cdot \hbar}{e^{2}\cdot m}$