Model of the Atom Time Line
by Jared Thomas
John Dalton's Model (1803)
John Dalton proposed that all matter was made up of very tiny things called atoms. The idea wasn't new however, as Democritus proposed that all matter was made up of tiny indivisible objects.
J.J. Thomson's Model of the Atom (1897)
It was proposed by Thomson after the discovery of the electron but before the finding of the atomic nucleus. It is commonly known as the "Plum Pudding" model
"Plum Pudding" Model
Hantaro Nagaoka's Model of the Atom (1904)
Nagaoka was the first in the world to present a Saturnian model of the atom. In his model the electrons orbit around then nucleus, like Saturn's rings, and the nucleus has a positive charge.