Question: Democritus

Answer: Invented the idea of the atom, thought that atoms were indivisible, believed that different states of matter had differently shaped atoms.

Question: John Dalton

Answer: Postulated that Atoms were dense spheres, proposed that atoms of the same element are identical, stated that chemical reactions are the rearrangement of atoms.

Question: J.J. Thomson

Answer: Discovered electrons, developed the Plum Pudding Model

Question: Max Planck

Answer: Discovered that light and other electromagnetic waves were emitted in packets of energy called “quanta”

Question: Robert Millikan

Answer: Performed the Oil Drop experiment, discovered the charge of electrons