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He discovered the element thallium and show there is a negative charge in atoms.

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He proposed the plum pudding model of the atom, which had negatively-charged electrons embedded within a positively-charged "soup."

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He postulated the nuclear structure of the atom, discovered alpha and beta rays, and proposed the laws of radioactive decay.

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He discovered the elementary charge of an electron using the oil-drop experiment.

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He was most famous for his discovery of the neutron in an atom. He established that atomic number is determined by the numbers of protons in an atom.

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He proposed that all matter was composed of atoms, indivisible and indestructible building blocks.

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He created the first atomic model.

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He developed a theory that was based on the four elements.