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Greek philosopher - atoms=indivisible, small and hard particles
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Greek philosopher-denied existence of atom
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British scientist - elements combined specific proportions. Atoms combined with another one= new substances
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Organized periodic table
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British scientist - atoms exist smaller particles. Electron = negative particle
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American physicist - mass of electron, electrin present in all atoms.
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Atoms = small charged nucleus surrounded by largely empty space.
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Danish scientist - developed atom of atom, energy levels are discrete
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Neutron = particle
Neutrons = central of atoms