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460
democritus
His hypothesis was that matter is made of indivisible particles caaled atoms. -"father of modern science" -
John Dalton
His hypothesis was that matter was made of spherical masses in motion. -
J.plucker
used cathode rays, used with electrons -
William Rotegen
discovered x-rays that use cathode rays that involve atomic theory. -
JJ. Thomson
described the atom as a ball of positive charge containing a number of electrons -
Ernest Rutherford
Used the "Gold Foil" experiment to determine that the nucleus of the atom is very dense and had a positive charge. Discovered the proton. Electrons were outside the nucleus of the atom. -
Niels Bohr
explained the atomic structure of the atom as succesive orbital shells of electrons
model is known as the Bohr plantary model -
schrodinger
identified the electron cloud model as the probable location of moving electrons. -
cockroft and walton
figured out you could split the arom. -
james chadwick
discovered a particle within the nucleus that has a mass similar to that of a proton. thus, he credited with discovering the neutron. -
openheimer
atomic bomb which was made from cockroft and waltons discoveries was dropped on Japan to end world war two.
