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John Dalton
John Dalton begins research in the atomic field and makes an atom model of a small solid sphere. -
Sir william Crookes
Sir William Crookes uses a cathode ray tube and finds out theroies about electrodes. -
J.J. Thomson
Thomson added negative electrons to Daltons model. He envisioned a positively charged orb with little negatively charged particles in it. -
Ernest Rutherford
Mr. Rutherfield discovered a nucleus within the atom. He made a conclusion about positively charged particles called protons within the nucleus. -
Niels Bohr
Bohr discovered that the elctrons might move in specific orbits around the nucleus, -
Sir James Chadwick
Sir James discovered the subatomic particle called the neutron. It is located within the nucleus. -
Period: to
Electron cloud
The electron cloud theory was proposed