Key Atomic Theory Developments: From Dalton to Quantum Models

John Dalton

Proposed that all matter is composed of extremely small particles called atoms

Law of Multiple Proportions

Developed by John Dalton.

Joseph Proust

Developed the Law of Definite Proportions.

Antoine Lavoisier

Pioneer of modern chemistry

J. J. Thomson

First to identify electrons as subatomic particles.

Plum pudding model

Proposed by J. J. Thomson.

Ernest Rutherford

Proved atoms have a dense

Niels Bohr

Discovered that electrons orbit the nucleus in specific energy levels.

Quantum model of an atom

Proposed by Niels Bohr.

Werner Heisenberg

Demonstrated fundamental limitations in precisely measuring atomic particle properties.

Uncertainty principle

Proposed by Werner Heisenberg

Erwin Schrödinger

Discovered Wave mechanics in atomic structure.

Quantum mechanical model of the atom

Developed by Erwin Schrödinger.

Electron behavior

Described by Erwin Schrödinger using mathematical wave equations.

Louis de Broglie

Discovered Wave-particle duality.

Wave-like properties of matter

Proposed by Louis de Broglie.