Consider a hydrogen like atom whose energy in nth exicited state is given by  when this excited atom makes a transition from excited state to ground state, most energetic photons have energy ${\mathrm{E}}_{\mathrm{max}}$ = 52.224 eV and least energetic photons have energy ${\mathrm{E}}_{\mathrm{min}}$ = 1.224 eV. The atomic number of atom is
(a) 2                 (b) 5
(c) 4                 (d) None of these