Radius of 'n'th orbit of hydrogen like species of atomic no.'z'

If you want to ask questions about the "following", then I suggest that you make sure that there is something that is following.

Rutherford discovered that the atom has a nucleus, bohr's discovery is found on the Wikipedia Link further down this page.

Few question and answers on Bohr's atomic model

The basic assumption in Bohr's model of an atom is that
The energy of electron is quantised
In Bohr's model of the hydrogen atom
the radius of the nth orbit is propotional to n² the angular momentum of the electron in an orbit is an integral multiple of h/2λ the magnitude of potential energy of the electron in any orbit is greater than its K.E.

Niels Bohr invented the bohr diagram.

The son of Niels Bohr is Aage Bohr.