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This greek philosopher first suggested that all substances of tiny indestructible particles called atoms.
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HIs theory composed of:
-All matter consisted of atoms
-Atoms can not be divided
-Atoms of the same element were alike
-Atoms combined into simple whole number ratios -
He discovered that electrons had a negative charge
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He proposed that the atom consisted of mostly empty space with a dense nucleus conatining positively charged protons
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He suggested that electrons orbited the nucleus at different energy levels
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He dicovered that the nucleus contained particles called neutrons as well as protons
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