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Proposed that atoms are indivisible.
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Denied the existence of atoms. Elements are indivisible substances.
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Atoms of a same element are identical.
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Proved that atoms are divisible
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Determines electrons have negative charge and are present in all atoms
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New model, nucleus is a positive region with electrons orbiting around it.
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Atomic number = # of protons
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Electrons orbit around the nucleus in different levels
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Electrons travel the nucleus as a cloud
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Neutron is a particle found in the nucleus, it has no charge
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