Atom Theory Timeline
Keona is the best!!
Ancient Greek Model!
400bc Democritus- If you cut an object in half many times it would be cut down into a small particle that couldn't be cut any more.
350bc Aristotle- Added that matter came in four elements Earth,Air,Fire,Water.
Dalton model!
1803- A atom is like a tiny sphere, Dalton said that atoms cannot be divided elements of the same (like a bar of gold )
Thompson model!
1897-Thompson proposed that atoms were spheres of positive electricity that had pieces of negative energy
Rutherford model!
1908- Rutherford did a experiment where he shot tiny sheets of gol foil most of it passed through telling him that they had empty space
Bohr model!
1913-Bohors model was consistent of a central nucleus (composed of protons and neutrons) surrounded by tiny particles called electrons.
Broglie and schrodinger model!
1920- Broglie and schrodinger developed the electron cloud they theroized that the Bohr model was incomplete and that electrons do not orbit like planets