# Stability of an atom in absence of EM field

According to Bohr model of atom, electrons move up an energy level in presence of EM field and emit a photon moving down the level.

In complete absence of any external EM field, shouldn't the electron collapse into the nucleus since it would keep losing energy as photons but wouldn't gain any?

(I do know (a little) about quantum mechanics and also that Bohr model is severely lacking. I was wondering if Bohr model had explained this phenomenon.)

• Yes it should, so Bohr atom is impossible. End of story. Feb 2 at 11:31
• I'd suggest learning some basic quantum mechanics since this observation was one of the key anomalies that led to its development. Feb 2 at 11:36
• No, Bohr's model hadn't explained this phenomenon(historically). But during that time the idea of 'Quantum ' hadn't been yet applied to matter. By taking the ad hoc assumption that electrons can occupy only some specific orbits in which the angular momentum has specific values(quantised) and by assuming that in these energy levels it does not radiate energy(another ad hoc assumption), Bohr basically explained the major features of the atomic spectrum which was a great feat at that time since there was no classical explanation for the discrete nature of atomic spectra.
– user102687
Feb 6 at 17:36

The Bohr model was significant progress in its time, predicting many observations. But it was later abandoned for its various shortcomings. The major issue was addressing the electron orbital angular momentum and problems with its zero value ( the quantum number $$\ell=0$$ ).