-
400
Democritus
(400 BC; no specific date) Democritus was a Greek philosopher that suggested from his studies the Atom theory. He said, "Composed of minute, invisible, indestructible particles of pure matter which move about eternally in infinite empty". That state was actually accurate. -
Isaac Newton
(I chose this scientist) Isaac Newton was an English Physicist that proposed the idea of a mechanical universe with small solid masses in motion. -
John Dalton
John Dalton was a British schoolmaster and chemist that proposed an "atomic theory" with spherical solid atoms based upon measurable properties of mass. -
Michael Faraday
Michael Faraday was an English scientist who contributed to the fields of electromagnetism and electrochemistry. His main discoveries include those of electromagnetic induction, diamagnetism and electrolysis. Studied the effect of electricity on solutions, term "electrolysis" as a splitting of molecules with electricity, developed laws of electrolysis. -
J.J. Thomson
J.J. Thomson was an British physicist that used a CRT to experimentally determine the charge to mass ratio (e/m) of an electron =1.759 x 108 coulombs/gram. -
Ernest Rutherford
Ernest Rutherford was a British chemist and physicist (originally born in New Zealand) that studied radiations emitted from uranium and thorium and named them alpha and beta. And using alpha particles as atomic bullets, probed the atoms in a piece of thin (0.00006 cm) gold foil. He established that the nucleus was: very dense,very small and positively charged. He also assumed that the electrons werelocated outside the nucleus. -
Erwin Schrödinger
(German) He published his work that included a theoretical basis for the atomic model that Niels Bohr had proposed based on laboratory evidence. He also introduced "wave mechanics" for a mathematical model of an atom and made his own equation to understand atoms better. -
James Chadwick
James Chadwick was an English physicist who was awarded the 1935 Nobel laureate in physics for his discovery of the neutron in 1932. Using alpha particles he discovered a neutral atomic particle with a mass close to a proton. Then he discovered the neutron. -
Niels Bohr
Niels Bohr was a Danish physicist that developed an explanation of atomic structure that underlies regularities of the periodic table of elements. His atomic model had atoms built up of sucessive orbital shells of electrons.
