Atomic Theory Timeline

Charles Goodyear Accidentaly invented rubber.

Sir Isaac Newton Proposed the world be universe to be made with "small solid masses in motion".

William Crookes Discoverd the Cathrode Ray

G.J. Stoney Proposed the electron.

J J Thompson Discovers the charge to mass ratio of an electron

Ernest Rutherford Estimated toe size of an atom.

Hantaro Nagaoka Created an atomic model with electrons rotating around a single positive charge.

Ernest Rutherford Won Nobel Peace Prize for his discovories.

Francis Aston Discovered Isotopes using a mass spectograph.

Enrico Fermi Made an experiment that realeased energy from an atom.

Democritus - The Greek philosopher Democritus was the first person to propose the idea that matter was not infinitely divisible. He thought that matter was created of "atmos" which is where the word atom came from.

Aristotle One of the most influential philosophers, Aristotle was key in the rejection of the concept of the atom.

John Dalton John Dalton revived and revised Democritus's ideas based upon the results of scientific research he conducted. He came up with the atomic theory.

J J Thompson used cathode rays to discover the electron measured the bending of the rays to determne the charge to mass ratio of the electron modified cathode ray tubes were used to discover the positively charged proton - Plum Pudding Model