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1.Stated all matter is made of atoms. 2. atoms can not be crated or destroyed. 3. All atoms of a given element are identical. 4.Atoms always combine in whole number ratios. 5. Atoms can not be divided.

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Schrondiner created the electron "cloud" structure. Heisnberg used a microscope to measure the momentum from the electron

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Discovered the neutron in 1932

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Proposed a theory for the hydrogen atom based on quantum theory that energy is transferred only in certain well defined quantities.

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Series of discoveries in the field of radioactivity and nuclear physics. Also identified alpha particles as helium nuclei.

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determined the unit charge of the electron in 1909

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Developed the atomic theory. Also discovered the electron by experimenting with a cathode ray.

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First person to study the burning process and proposed the Combustion theory that's based on. mass cant create nor destroy

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French chemist who stated that chemical compounds always combine in constant proportions. Helped discover oxygen. The law of definite proportions.

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He didn't believe in atoms but believed that the earth was made of only four elements which consist of earth, fire, water, and air.

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He held that everything is composed. Small, hard particle