Question

Why does not an electron lose energy as long as it revolves around a particular stationery orbit?

Answer 1

Actually, the energy of each orbit is fixed in which the electrons revolve continuously without loosing energy. The energy of each orbit is given by an expression,

E = 2 Ï€²me⁴ / n²h² = -1312/ n² KJ/mol

So, electron does not looses energy while revolving in a particular stationary orbit. However, they loose or gain energy when jumps to lower or higher energy levels respectively.