chem people

democritus

greek philosopher who said matter is made of atoms

Aristotle

greek philosopher who said matter was infinitely divisible

Robert Millikan

Measured charge of electron using oil drop experiment in 1909

Amedeo Avogrado

explained relationship between mass and number of atoms using 6.02×10²³

Ernest Rutherford

discovered nucleus of atom using gold foil experiment, discovered most of an atom is empty space

James Chadwick

discovered neutrons in 1932

Henry Moseley

discovered the atomic number of an element

Antoine Lavoiser

Law of Conservation of Mass

Joseph Proust

Law of Definite proportions

John Dalton

used experimental evidence of others to form the modern atomic theory, Law of multiple proportions

Thomson+Millikan

calculated mass of an electron to be 2000x smaller that a hydrogen atom

J.J. Thomson

discovered electrons using cathode ray tube