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He found that there are only five solid shapes whose sides are made from regular polygons. -
By laying doen the foundation of the Period Table of the elements. They broke down the chemical composition of fire, earth, wind, and water. -
Invented the theory posited that matter is all made up of small indestructible units called atoms. -
Solar System Model -
Discussed the possibilities of atoms existing. He proposed that elements are composed of "corpuscles" of various sizes and types that can be able to organize themselves into groups that represent different chemical substances. -
He determined that oxygen was a key substance in combustion. Also, total mass of products and reactants in a chemical reaction is always the same. -
Created the theory that all matter was composed of atoms. -
Billiard Ball Model -
Created the hypothesis that equal volumes of different gases contain an equal number of molecules. -
Discovered electron, the first subatomic particle to be discovered. -
He is considered the most important contributor to the development of the periodic table. -
Discovered two new elements, radium and polonium. -
Plum Pudding Model -
Proposed the quantum of light. He also started the equivalence of energy and mass through the theory of special relativity. -
Discovered the charge of an electron with his oil-drop experiment. -
He discovered that there are two types of radiation, alpha, and beta particles coming from uranium. He studies the radioactivity of the atom. -
Proposed an atomic structure theory that stated the outer orbit of an atom could hold more electrons than the inner orbit. -
He concluded that the atomic number is the number of positive charges in the atomic nucleus. -
Used mathematical equations to describe the likelihood of finding an electron in a certain position. -
Electron Cloud Model -
Formulated quantum mechanics in terms of matrices and discovered the uncertainty principal. -
Discovered the existence of neutrons.