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Proved the existence of the neutron.

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Proposed a theory for the hydrogen atom based on quantum theory. Proposed that energy is transferred only in certain well defined quantities. Electrons only move around the nucleus in specific orbits. When jumping from one orbit to another with lower energy, a light quantum is emitted. His theory explains why atoms emit light in fixed wavelengths.

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Discovered the electron.

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Dalton’s Atomic Theory: All matter is made of indivisible and indestructible particles called atoms, which are unique to each element. Compounds are combinations of atoms, and a chemical reaction is a rearrangement of atoms.

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Everything is composed of “atomos,” tiny indivisible particles that differ in size and shape and are in constant motion through a void. When they collide, atoms could rebound or stick together, leading to changes in matter.

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Made progress in the study of radioactivity which led to the discovery of the elements radium and polonium.

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Conducted the Gold Foil Experiment and concluded that the atom consists of a small, dense, positive nucleus in the center with negative electrons surrounding it.