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Democritus
He started his studies around the 5th century B.C. He had an idea of the atom and made an experiment to prove it. He broke up a piece of gold until he couldn't anymore and he discovered it was still an atom. -
John Dalton's Model
He researched olefiant gas and hydrogen. He also discovered the different properties in chemical combinations. -
Henri Becquerel
He investigated the connections between x-rays and salt. He also an element in the uranium atom. -
William Crookes
He discovered the properties in the cathode rays and he broke up yttrium to look at the spectrums. -
J.J. Thompson
He tested that Lenard rays could travel a longer distance through air. He also discovered that cathode rays were 1,000 times lighter. -
Niels Bohr's Model
He discovered the hydrogen atom. He noticed the electrons rotate circularly around the nucleous of the atom but only som orbits are permitted. -
Ernest Rutherford's Model
He studied the nuclei of the atoms and he discovered the nuclei of light atoms could be disintegrated. -
James Chadwick
James Chadwick proved the existance of the neutron and he tested how all the parts work together. -
Current day Current Day Model
The current day atomic model is John Daltons atomic model.
