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All metals are composed of mercury and sulfur and it is possible to change base metals into gold.
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Democritus model states matter consists of invisible particles that are atoms and a void that is empty space. He says atoms are unchangeable and indestructible.
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Plato introduces the atomic theory that ideal geometric forms to serve as atoms according to which atoms broke down mathematically into different triangles.
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Aristotle thought that all materials on Earth were not made of atoms but made of four elements, Earth, Fire, Water, and Air. Aristotle believed all substances were made of small amounts of these four elements of matter.
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This states that if the volume of a gas is degreased, the pressure increases proportionally.
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Lavoisier found that mass is conserved in a chemical reaction.
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In chemical reactions, atoms are combined, separated, or rearranged.
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The Periodic Law states that when elements are arranged according to their atomic number, elements with similar properties will appear at regular intervals.
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Thomson discovered the electron in 1897 and proposed the plum pudding model of the atom in 1904
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They discovered two new elements, radium and polonium.
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He mathematically proved the existence of atoms.
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He was the leader of the exploration of nuclear physics.
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Henry G. J. Mosely reported that the frequencies are proportional to the squares of whole numbers that are equal to the atomic number plus a constant.
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Nails Bohr was a Danish physicist who made contributions to understanding atomic structure and the quantum theory.
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Roberts study of the elementary electronic charge and the photoelectric effect.
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That there is a way to formulate quantum mechanics in terms of matrices.
