• Danish physicist Niels Bohr (1885 – 1962) proposed a new model of the atom in 1915.
  • Bohr’s work was primarily based on the emission spectra of hydrogen.
  • It explained the inner workings of the hydrogen atom.
  • The Bohr model postulates that electrons orbit the nucleus at fixed energy levels.
  • When the energy is removed, the electrons return back to their ground state, emitting a corresponding amount of energy – a quantum of light, or photon.
  • This was the basis for what later became known as quantum theory.
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