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Dalton: Solid Sphere Model
John Dalton was an English chemist who coined the theory that all matter was composed of small indivisible particles called atoms. He said these atoms possess unique characteristics and weight for different elements. He also stated that three types of atoms exist: simple, compound, and complex. -
Period: to
first date to todays date
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Thompson: The Plum Pudding Model
J. J. Thomson proposed this model soon after the discovery of the electron. Before the discovery of the atomic nucleus, the model represented an attempt to consolidate the known properties of atoms at the time: 1) electrons are negatively-charged particles and 2) atoms are neutrally-charged. -
Rutherford: The Nuclear Model
Earnest Rutherford directed the famous Geiger–Marsden experiment in 1909 which suggested, upon Rutherford's 1911 analysis, that J. J. Thomson's so-called "plum pudding model" of the atom was incorrect. -
Bohr: The Bohr (Planetary) Model
The Bohr model, introduced by Niels Bohr, depicts the atom as a small, positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus—similar in structure to the solar system, but with attraction provided by electrostatic forces rather than gravity. -
Schrodinger: Quantum Mechanics Model
In quantum mechanics, the Schrödinger equation is a partial differential equation that describes how the quantum state of a quantum system changes with time.