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The History of the Atom
Quantum Model

The quantum theory is the most up-to-date theory of the times. Its' model of the atom explains its stability and like Bohr's Model, treats atoms as electrons surrounding a nucleus. The electrons, however, do not have a planetary orbit. Instead, the theory gives the location of an electron as a probability instead of showing it at a certain position. The easiest way to describe the differences between the allowed and prohibited positions of electrons in an atom is to think of the electron as a wave. The wave-particle duality of quantum theory allows electrons to be described as waves, instead of particles. Keep in mind that this theory may be disproved in the near future and replaced with a new model with even more complicated mathematical calculations.

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This graph shows the probable density of an electron.

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This equation is used to find wave functions of an electron in hydrogen.

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