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Isaac Newton
He proposed a mechanical universe with small solid masses in motion. -
John Dalton
He proposed an "Atomic Theory" with spherical solid atoms based upon measurable properties of mass. -
Michael Faraday
He studied the effect of electricity on solutions as a splitting of molecules with electricity, and developed laws of electrolysis. -
J Plucker
He built the first gas discharge tubes. -
Lothar Meyer
Classified elements into six families by their valence -
Dmitri Mendeleey
He arranged elements into 7 groups with similar properties. He created the Periodic Law -
James Clerk Maxwell
Proposed electric and magnetic fields filled the void. -
Sir William Crookes
He discovered cathode rays has certain properties. -
E. Goldstein
Used a CRT to study canal rays which had electrical and magnetic properties opposite of an electron -
J.J. Thomson
Used a CRT to experimentally determine the charge to mass ratio of an electron and studied canal rays and found they were associated with the proton H+ -
G.J. Stoney
Proposed that electricity was made of discrete negative particles he called electrons. -
WIlhelm Roentgen
Using a CRT he observed that nearby chemicals glowed. He made them X-rays -
Henri Becquerel
He discovered some chemicals spontaneously decompose and give off very penetrating rays. -
Rutherford
Studied radiations emitted from uranium and named them alpha and beta. -
Soddy
Observed spontaneous disintegration of radioactive elements into variants he called isotopes -
Nagaoka
Postulated a model of the atom with flat rings of electrons revolving around a positively charged particle -
Abegg
Discovered that inert gases had a stable electron configuration which lead to their chemical inactivity -
Albert Einstein
Published the famous equation E=mc 2 -
Hnas Geiger
Developed an electrical device to click when hit with alpha particles -
R.A. Millikan
Oil drop experiment determined the charge and the mass of an electron -
Ernest Rutherford
Used alpha particles as atomic bullets, probed the atoms in a piece of thin gold foil -
H.G.J. Moseley
Using x-ray tubes, determined the charges on the nuclei of most atoms -
Aston
Discovered the existence of isotopes through the use of a mass spectrograph