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Believed that atoms were uniform, solid, hard, incompressible, and indestructible, and that they moved in infinite number through empty space until stopped. -
Theorized that the soldi forms of matter are composed of indivisible elements shaped like triangles. -
Proposed by Plato. It placed the planets in the solar system in order from the Earth. -
Believed that all metals were formed from mercury and sulfur. -
Created Boyle's law that stated that a gas's pressure and volume are inversely proportional. -
Made two hypotheses stating 1) that equal volumes of gas contains equal numbers of molecules and 2) that elementary gases such as hydrogen, nitrogen, and oxygen were composed of two atoms. -
Made the law of conservation of mass that stated that in a chemical reaction, mass is neither created nor destroyed. -
Suggested that all matter was compromised of indivisible and indestructible atoms with distinct masses and properties. -
Created by John Dalton. This model defined an atom to be a ball-like structure. -
Created the periodic table by arranging the atoms in order of increasing atomic mass. -
Discovered the electron and then went on to propose a model for the structure of the atom. -
Discovered the strongly radioactive elements polonium and radium. -
Created by JJ Thompson. Showed the electrons embedded in a uniform sphere of positive charge like blueberries stuck to a muffin. -
Mathematically predicted the size of both atoms and molecules. -
Precisely determined the magnitude of the electron's charge. -
Described the atom as having a tiny dense, and positively charged core called the nucleus.
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Proposed a model of the atom where the electron was only able to do certain orbits around the atom's nucleus. -
Arranged the elements in the periodic table according to atomic numbers. -
Formulated a type of quantum mechanics based on matrices. -
Formulated a wave equation that accurately calculated the energy levels of electrons in atoms. -
Made by physicist Erwin Schrodinger. Represents the area around an atom's nucleus where electrons are most likely to be found. -
Discovered the neutron.