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Developed the theory that all metals are composed of mercury and sulfur, and it is possible to change base metals into gold.
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Aristotle did not believe in the atomic theory. He thought that all materials on Earth were not made of atoms, but of the four elements, Earth, Fire, Water, and Air.
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His theory stated that everything is composed of atoms, and that they are all physically invisible.
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Produced the theory that ideal geometric forms serve as atoms, and that atoms break down mathematically into triangles.
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Proposed the "Boyles Law" that states if the volume of a gas is decreased, the pressure increases proportionally.
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Lavoisier found that mass is conserved in a chemical reaction.
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His atomic theory proposed that all matter was composed of atoms, indivisible and indestructible building blocks. Because Dalton thought atoms were the smallest particles of matter, he envisioned them as solid, hard spheres, like billiard (pool) balls, so he used wooden balls to model them.
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He is known for his work on the Periodic Law and creation of the first Periodic table.
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Pierre and Marie Curie discovered polonium and radium.
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Thomson proposed the plum pudding model of the atom, which had negatively-charged electrons embedded within a positively-charged "soup."
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His atomic theory says that any liquid is made up of molecules, and these molecules are always in random, ceaseless motion.
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His earliest major success was the determination of the charge carried by an electron, using the “falling-drop method.
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He postulated the nuclear structure of the atom, discovered alpha and beta rays, and proposed the laws of radioactive decay.
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He proposed the Solar System Model which stated that electrons revolve around the nucleus like planets revolving around the sun.
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He experimentally demonstrated that the major properties of an element are determined by the atomic number, not by the atomic weight.
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He contributed to atomic theory through formulating quantum mechanics in terms of matrices and in discovering the uncertainty principle, which states that a particle's position and momentum cannot both be known exactly.
