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Democratis discovered the first accurate assertion of the atom. he said that matter was made up of smaller particles called atomos, meaning invisible.
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Known for creating the cosmogenic theory of the 4 classical elements.
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Belelived the opposite of atomic theory, that all elements were of the 4 classic elements, water, earth, fire, and air.
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Discover air has weight, therefore atoms have mass.
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Antoine proposed the law of conservation of mass.
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Dalton proposed all matter is made up of tiny prticles, atoms were indecstructable and unchangeable, atoms of the same element are identical, and atoms combine in mew ways in chemical changes.
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He was best known for his discovery of the law of constant composition in 1794, which said that chemical compounds always combine in constant proportions.
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Thomson was responsible for disciveringg the first subatomic particle, the electron. he also created the plum pudding model.
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Researched radioactivity, and in 1898, announced the discovery of 2 new elements, radium and polonium.
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Rutherford proformed the gold foil experiment and discovered the nucleus.
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Originated the atomic-quantum theory.
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Received a nobel prize for the contributions to create the atomic model. Believed that electrons orbited the nucleus much like the planets orbit the sun.
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Believed that all atoms had a natural wave effect, helped create the quantum model where electrons orbit the nucleus in a quantum cloud, not like the planets in our solar system.
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Responsible for creating the first electron cloud model.
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Discovered the neutron, or neutral subatomic partial, fairly large in size. Believed they were in the nucleus with the protons.