sep 29, 1926 - William Heisenberg's Discovery 1926 - Present
William Heisenberg figured that knowing the position of an electron or its speed are not definite.
One option is only available in this theory.
He supported an Electron Cloud Model that predicts an area where an electron could be.
It's known as the Quantum Mechanical Model.
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"History of the Atom" - Physical Science - Shahroze M.
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