Scientists

J. J. Berzelius

given credit for creating the modern symbols of elements.

Democritus

philosopher who thought of matter as small particles

John Dalton

re-proposes atomic theory / Law of multiple proportions

Joseph Proust

Law of constant proportions

Antoine Lavoisier

Law of conservation of mass

J. J. Thompson

Discovered atoms are made up of smaller things.

Robert A Millikan

Determined the charge of an electron

Ernest B. Rutherford

Radioactivity

Chadwick

Discovered neutron