Neils Bohr - Danish Physicist
(1885-1962)
1913
Bohr develops a new model of the atom in which he explained the spectrum of hydrogen by introducing quantized electron orbits. Bohr postulated that atoms don't collapse and that light is emitted from atoms at only certain wavelengths because the electron can exist in only certain orbits or energy levels. We say that the energy of the electron is quantized, that is, it can have only certain discrete energies and none in between.

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