jan 1, 1925 - Werner Heisenberg

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In Niels Bohr's theory of the atom, electrons absorb and emit radiation of fixed wavelengths when jumping between fixed orbits around a nucleus. The theory provided a good description of the spectrum created by the hydrogen atom, but needed to be developed to suit more complicated atoms and molecules. Werner Heisenberg formulated a type of quantum mechanics based on matrices, he also proposed the "uncertainty relation", setting limits for how precisely the position and velocity of a particle can be simultaneously determined. Werner effectively expanded the theory for most atoms.

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