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Created the atomic theory. believed that everything was made up of atoms of differing weights that combine in simple ratios by weight.
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Did not believe in atomic theory and taught against it. believed there were four elements. Water, fire, air, and earth.
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Plato's theory of forms. believed that everything we see and know is made up of "forms".
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found that everything is made of atoms. believed that all atoms are indestructible and are infinite amounts of them.
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Developed a definition of an element. he also contributed to "the death" of the four elements,
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Helped in discovering the law of conservation of mass. Found that the total mass of products and reactants is always the same.
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Formulated the first modern description of the atom as a fundamental building block of chemical structures. Also developed the law of multiple proportions.
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Created the periodic table. Organized elements in rows according to their atomic mass to create the periodic table.
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Discovered the electron. Created the "plum pudding" model.
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discovered radium and polonium. helped to learn about radioactivity.
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Mathematically proved the existence of atoms which helped improve all science through use of statistics and probability.
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used "the oil drop" experiment to help quantify the charge of an electrons. helped advance our knowledge of the structure of the atom and the atomic theory.
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Found the atom is made up of mostly empty space with a nucleus packed with particles in the middle. Also discovered alpha and beta rays.
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Created the Bohr model; explained how electrons orbit around a atomic nucleus.
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Discovered the systematic relation between wave-length and atomic number. he named this Moseley's Law.
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formed quantum theory in terms of matrices. He also discovered the uncertainty principle, which shows that particles position and momentum cannot both be known exactly
