atom structure

Democritus

names atom, not a scientist

Aristotle

also not a scientist

John Dalton

Proposed solid sphere model, shifted from philosophy to scientific theory

Dmitri Mendeleen

developed first periodic table

JJ Thomson

proposed plum pudding model, discovered electrons, shifted from indivisible atom to subatomic particle

Cathoid Ray Tube

passes ray through plates leans toward positive

Ernest Rutherford

Introduced Nuclear Model, first model to propose a nucleus

Gold Foil Experiment

launches alpha particle when it hits solid nucleus it bounces back

Henry Moscle

proton is unique to each element

Niels Bohr

Made Bohr model, introduced energy levels with zones

Ernest Schrodinger and Werner Heisenberg

proposed quantum model founded modern atomic theory