Niels Bohr concluded that Rutherford's model was inherently unstable as the protons and electrons Rutherford had proposed should, in all likelihood attract each other. With this in my mind, Bohr suggested his own theory. This entailed that:
- Electron's exist in orbitals
- When they absorb energy, they move to a higher orbital
- When they release energy (as a photon of light), they move to a lower orbital
What Did Bohr Base His Model On?
Knowing that white light can be separated into colours with a diffraction prism of sorts, Bohr could postulate that each element emitted an unique set of colours or line. Each atom had a specific spectra of light and this uniqueness of the elements was reflected by how electrons occupied their orbital shells.
Visually these differences can be shown with a Bohr Model (as shown above) or an emission spectrum.
Hydrogen can appear as follows:
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