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Believed that all matter consisted of extremely small particles that could not be divided.
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All matter is made up of individual particles called atoms, ehich cannot be divided.
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First evidence that atoms are made of even smaller particles.
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Atoms have a central nucleus. Electrons move in orbit like the rings around Saturn.
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Atom has a dense, positively charged nucleus. Electrons move randomly in the space around the nucleus.
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Electrons move in spherical orbits at fixed distances from the nucles.
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Describe te possible locations of electrons around the nucleus.
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Existence of neutrons that have no charge. Atomic nuclei contain neutrons and positively charged protons.
