ATOMIC THEORY TIMELINE

John Dalton proposed his theory on atoms.

Dmitri Mendeleeve created the periodic table

G.J. Stoney theorised that electricity was composed of negative particals that he called electrons

E. Goldstein discovered canal rays that had a positive charge equal to an electron's

JJ Thompson discovered the electron

JJ Thompson determined the charge of mass ratio to electrons

Rutherford found alpha, beta, and gamma rays in radiation

Niels Bohr proposed a new atomic theory

Niels Bohr proposed a thoery of the atomic structure stating that the outer orbit of an atom could hold more than the inner orbit