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Period: 400 to
Atomic Theory
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Dalton's Discovery
Born September 6, 1766, in Eaglesfield, England
Died July 26 1844
Said
-all matter is made of atoms
-atoms cannot be broken down in any way
-all atoms of any one element are exactly the same
Made theory after experimenting with gasses
Fact
Was colorblind --biography.com
--www.iun.edu
--www.abcte.com -
Thomson's Theory
Born December 18, 1856, in Cheetham Hill, Engand
Died Aug 30, 1940
Experiment
- Cathode Ray Experiment
Discovered the electron
Discovered the electron's negative charge
"Plum Pudding Model"
Fact
-Thomson was almost an engineer, but couldn't get the education
(Exact date of discovery unknown)
--biography.com -
Rutherford's Discovery
Born August 30, 1871
Died Oct 19, 1937
Performed the Foil Experiment
Realized that most of the mass of an atom is inside the nucleus
Discovered the existence of the nucleus
The neutron remained undiscovered
Fact
During WWI, Rutherford researched antisubmarine weapons -
Niels Bohr's Discovey
Born Oct 7 1885
Died Nov 18, 1962
Said that electrons are in separate orbits
Studied Rutherford's and Thomson's models to get theory
Fun Fact: Met both Rutherford and Thomson
--biography.com
--www.livescience.com -
Modern
Schrodinger developed the electron cloud
Born Aug 12, 1887
Died Jan 4, 1961
Chadwick discovered the neutron
Born Oct 20, 1891
Died July 24, 1974
--www.nobelprize.org
--www.biography.com
--www.abcte.org
--abcte.org -
Democritus' theory is formed
The exact date is unknown
Lived from 460BC - 370BC, in Abdera, Thrace
Said everything is made of "atomos"
Atomos means uncuttable
He didn't do an experiment, this was philosophy
Fact
Democritus' idea wasn't considered "true" because everyone thought Aristotle was "right" (Until Dalton)
--www.egs.edu
--antonine.frostburg.edu
--biography.com
(492 is really 492 BC, but timetoast doen't allow BC in the date)
