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John Dalton
Believed that Atoms were tiny indestructible spheres. -
J.J. Thomson
Discovered the electron. Led to his "plum-pudding" model. Believes that electrons are in the sphere with a positive charge. -
Hantaro Nagaoka
Says that an atom has a nucleus. Also notes that the electrons orbit the nucleus. -
Ernest Rutherford
Says that an atom has a heavy positively charged nuclues. Also, that electrons float around every which way around the nucleus. -
Niels Bohr
The electrons orbit at certain distaces from the nucleus. They have two energy levels. The electrons lose energy every level. -
Erwin Schrodinger and Werner Heisenberg
Developed equations to figure out the movement of atoms. Created the electron cloud. this is the are that contains only electrons that is less dense than the nucleus and outside of the nucleus. -
James Chadwick
James Chadwick confirmed the existence of the neutron. These neutrons have no charge, but have a mass. It was now shown that the neucleus contains both positively charged protons and charge-less neutrons.
