September 15, 2020
For educational institutions
atomic time line
⟶ Updated 19 Oct 2018 ⟶
List of edits
James Chadwick- He discovered the neutron
Democritus- idea of the atom, everything is made up of them, atoms are all different in shape+size they are in constant motion they can collide and stick together. this is the reason for change of states
Robert Millikan determined the size of the charge on an electron.
In 1911, Ernest Rutherford was the first to discover that atoms have a small charged nucleus surrounded by largely empty space, and are circled by tiny electrons.
Bohr planetary model 1913- atom a small, positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus
Robert Millikan- determined the size of the charge on an electron. He also determined that there was a smallest 'unit' charge
electric charge-observing tiny electrically charged droplets of oil located between two parallel metal surfaces, forming the plates of a capacitor.
J.J thomson cathode ray tube experiment- electron, the first of the subatomic particlescathode rays were made of electrons, very small negatively charged particles.
J.J thomson Plum pudding -Thomson proposed a model of the atom in which negative electrons are scattered throughout a sphere of positive charge
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