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1. atoms are tiny, invisible particles. 2. atoms of one element are all the same 3.atoms of different elemnts are different 4.compounds form by combining atoms
John Dalton created the first atomic theory. His theory had 4 statements...
J.J Thomson discovered electrons, he also did the cathode ray tube experiment.
Negative charges spread out in a sea of positive charge
ATOMS ARE MOSTLY EMPTY SPACE
Rutherford discovered the protons and the nucleus, he also made the gold foil experiment.
He proposed that electrons move around the nucleus in specific layers, or shells. James Chadwick discovered particles with no charge he called it neutrons
Electron are in clouds called orbital
It is impossible to know where an electron is located at any given time
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