But there was good evidence he was right: the electrons in his model lined up with the regular patterns (spectral series) of light emitted by real hydrogen atoms. Bohr's theory that electrons ...

Bohr’s model, however, suggested that certain orbits were stable and would not radiate energy. Moreover, the model was able to explain the hydrogen atom’s spectral lines, a problem that had ...

Bohr proposed adding to the model the new idea of quanta put forth by Max Planck in 1901. That way, electrons existed at set levels of energy, that is, at fixed distances from the nucleus.