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Discovered the electron. Found the first evidence of for isotopes of a stable element.

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Proposed laws of radioactive decay and half life. Discovered alpha and beta rays. Discovered the nuclear structure of an atom.

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States that everything is composed of atoms, which are indestructible and have empty spaces between these atoms. Gave the basics of what atoms are.

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Developed the Law of Partial Pressures and atomic theory where every form of matter was made up of small particles.

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Discovery of polonium and radium (radioactive elements) and the further development of x-rays.

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Discovered the neutron and inspired atomic bomb research.

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Contributions to understanding atomic structure and quantum theory. Electrons move around nucleus in an orbit.