The schrodinger wave equation for hydrogen atom is 
$\mathrm{\Psi }(\mathrm{radial})=\frac{1}{16\sqrt{4}}{\left(\frac{\mathrm{z}}{{\mathrm{a}}_0}\right)}^{3/2}\left[(\mathrm{\sigma }-1)\left({\mathrm{\sigma }}^2-8\mathrm{\sigma }+12\right)\right]{\mathrm{e}}^{-\mathrm{\sigma }/2}$
where a₀ and z are the constant in which answer can be expressed and $\mathrm{\sigma }=\frac{2\mathrm{zr}}{{\mathrm{a}}_0}$ minimum and maximum position of radial nodes from nucleus are