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John Dalton
John Dalton spherical solid atoms based upon measurable properties of mass. -
William Crookes
Discovered cathode rays could, travel in straight lines from the cathode, cause glass to fluoresce, impart a negative charge to objects they strike, are deflected by electric fields and magnets to suggest a negative charge. -
Eugen Goldstein
He discovered that atoms had positive charges. -
G.J Stoney
Discovered that electricity was made of discrete negative particles he called Electrons. -
Dmitri Mendeleev
Put the elements in rows and columns -
J. J. Thomson
He changed the view of the atom with his discovery of the electron. Thomson's work suggested that the atom was not an indivisible particle. -
Ernest Rutherford
J.J Thomson imagined that atom had a structure of small clumps, that were negatively charged electrons. But Eugen proved Thomson wrong. He also discovered that while most of the alpha particles passed right through the gold foil, a small number of alpha particles passed through at an angle -
Neils Bohr
Discovered 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. -
James Chadwick
James discovered a third type of subatomic particle, which he named the neutron. Neutrons help stabilize the protons in the atom's nucleus.
