Consider an electron in the energy eigenstate \(\psi_{211}(\vec{r})\) of the hydrogen atom. Given that the radial probability distribution of the electron in such a state takes its maximum value at \(r = n_0 a\), where \(a\) is the Bohr radius, and \(n_0\) is an integer. The value of \(n_0\) (in integer) is . The radial part of the wavefunction \(\psi_{211}(\vec{r})\) is given by \(R_{21}(r) = \dfrac{1}{\sqrt{24a^{5}}}\,re^{-r/2a}\).