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Period: to
The Atom
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1808 Atom
Dalton Model
John Dalton was a Bristish scientist. He made a theory that all elements are made out of atoms. He thougtht they were all alike.
He thought thats atoms were very little solid balls. Almost like a pool pall. -
1897 Atom
Thomson.
A British scientist named J.J. Thomson founded the electron. Later on after he founded the electron he showed the world a new model. He thought that an Atom is a positively charged sphere with some electrons put in it. His model looked like a muffin with raisins scattern in it. -
1904 Atom
A japaneese man named Hanataro Nagaoka propsed a new model of an Atom that had a large sphere in the midle with a postitive charge. His model looked like a sphere with dots revolving around it, Planets with sun. -
1911 Atom
Another British man named Ernest Rutherford came toa conclusion that an Atom is mostly empty space. He also thought that orbits randomly circle around a small, positively charged nucleus. Looked a pit like a peach. -
The present day atom model
THe current modek from 1920 to now is that electrons forma negatively charged cloud around the nucleus. It is imposible to determine exactly where an electron is at a given time -
1993 Atom
BOHR.
A Danish physicist Niels Bohr made a new model that was showing that electrons moved around specific layers or shells not randomly. He said that in his model atoms absorb and give off energy when the electrons move from shells to other shells.
