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Discovered electron in 1897; known for plum pudding model. Cathode ray experiment. Discovered isotopes of elements. Another founder of quantum mechanics; famous for cat analogy Wave-particle duality theory of light meaning electrons have properties of both waves and particles Discovered protons in 1900; anode ray experiment; said that since atoms contain negatively charged particles, they must also contain positively charged particles in order to remain electrically neutral Planetary model of atom; Electrons move around the nucleus in fixed orbits, paths, or energy levels; spectrum lines produced when electrons move Greek philosopher; first to identify possibility of an atom; said matter made of smallest particles called atomos which means indivisible. Law of Definite Proportions = always have the same proportions of elements by mass (H2O is always 2 hydrogen and 1 oxygen) Discovered neutrons in 1932 which led to discovery of fission and the atomic bomb; helped with the development of the nuclear model Founder of quantum mechanics; uncertainty principle; impossible to determine the position and the momentum of a particle at the same time; “cloud” model aka quantum mechanical model Discovered atoms have a small positive nucleus and remainder is empty space; gold foil experiment; predicted existence of neutrons Observed isotopes Father of modern atomic theory that he proposed in 1808; developed concept of the mole; proposed system of symbols Dismissed Democritus’ atom idea as worthless; Founder of quantum theory; atoms can emit believed in reasoning instead of scientific ‘quanta’; Einstein used his work to study experiments; four ‘elements’ of earth, fire, air, photons; Planck’s constant water Law of Conservation of Mass = matter not created or destroyed, just changed in a reaction; named oxygen Oil drop experiment; measured charge of electron; worked with Thomson