2 2  Electron orbits
The Rutherford nuclear model of the atom which involves classical
concepts, pictures the atom as an electrically neutral sphere consisting
of a very small, massive and positively charged nucleus at the centre
surrounded by the revolving electrons in their respective dynamically
stable orbits The electrostatic force of attraction, Fe between the revolving
electrons and the nucleus provides the requisite centripetal force  (Fc)  to
keep them in their orbits Thus, for a  dynamically stable orbit in a
hydrogen atom
    Fe = Fc
2
2
2
0
1
4 ε
=
π
e
mv
r
r
(12