Chemistry Atomic Models

Democritus Model

Democritus

First person to think of the concept of atoms

Aristotle

Said all material is made of small amounts of Earth, Air, Fire, and Water

Dalton

Atoms are a uniform, solid sphere

Thompson Model

J.J. Thompson

Determined that atoms have negative particles within the atom

Other name for Thompson model

“Plum Pudding” 

Rutherford Model

Ernest Rutherford

Discovered the nucleus

Bohr Model

Niels Bohr

Said electrons occupy energy levels around a positive nucleus

Schrödinger Model

Erwin Schrödinger

Electrons can only exist in certain energy states, they are not particles