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first to suggest the existence of an atom
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Opposed Democritus's theory thought that matter was 4 elements combined.
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Changed science from observations to actual meausurement,allowing you to predict; also proved multiple compounds
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gave the first true model of what he believed an atom looked liked.
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discovered certain elements give off unique matter
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Gave the idea that the atom was mainly positve matter with little spots of negative energy; known as the plum atom
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Quantum theorm; deals with the smallest form of matter able to be measured
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mainly empty space, most energy is positve and located in the core (nucleus) and that the electrons move around the nucleus
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quantum mechanics; proposed that elctrons had a unique orbit around the nucleus
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Discovered charges in the nucleus. and that the atomic mass is the same amount as protons.
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Calculated the mass of an electron (charge:mass) (one negatifve:1/1840 hydrogen atom)
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Wave Mechanics; Delevoped the math equation for the electrons motion and created the cloud model of the atom.
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Created the "Uncertainty Principle"- determined the properties of particles; You can't determine the monmentum and position at the same time.
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Discovered and confirmed that the neurtron existed.
