12 Scientists who Contributed to atomic theory

Erwin Schrödinger

Developed a method for predicting the location of electrons, collaborated to develop the electron cloud model.

Niels Bohr

Developed the Bohr Model

Henry Moseley

Developed the application of X-ray spectra to study atomic structure, changed the numbering system from being based on Mass to being on based on protons.

James Chadwick

Discovered Neutrons

J.J. Thomson

Discovered electrons, developed the Plum Pudding Model

Ernest Rutherford

Discovered that atoms were mostly made of empty space and that electrons orbit around the nucleus

Louis De Broglie

Discovered that electrons can act like particles and waves, just like light.

Werner Heisenberg

Discovered that electrons do not travel in neat orbits, collaborated to develop the electron cloud model.

Max Planck

Discovered that light and other electromagnetic waves were emitted in packets of energy called "quanta"

Democritus

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

Robert Millikan

Performed the Oil Drop experiment, discovered the charge of electrons

John Dalton

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