Question

If the atom ${}_{100}F{m}^{215}$ follows Bohr's model and the radius of the 5th orbit of this atom is p times the Bohr radius, then the value of p is :

Answer 1

$\begin{array}{c}r=a_{\circ }\left(\frac{n^e}{z}\right)a_{\circ }=bohrradius\\ \Rightarrow r=a_{\circ }\left(\frac{25}{100}\right)=p{a}_{\circ }\\ \Rightarrow p=\frac{1}{4}\end{array}$