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Period: to
Atomic Theory
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Democritus
Developed the idea of the atom.
(460 b.c.) -
Antoine Lavoisier
He came up with the Law of Conservation of Mass. He also stated that oxygen was indeed an element. -
John Dalton
Developed 'Daltons Atomic Theory' -
Dalton's Atomic Theory
- All matter is made of atoms. Atoms are invisible and indistructable.
- All atoms of a given element are identical in mass and properties.
- Compounds are formed by combinations of 2 or different kinds of atoms.
- A chemical reaction is a rearrangement of atoms.
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Dmitiri Mendeleev
In 1869 he discovered 63 elements and created the Periodic Table to organize them. -
J.J Thomson
Discovered the electron -
Cathode Ray Tube
Created by Karl Braun in 1897.
Its a special, electronic vacuum tube that uses a focused electron beam to display images. -
Niels Bohr
He expanded Rutherfords atomic theory by proposing that electrons travel only in certian successfuly larger orbits,
( Invented the Bohr Planetary Model) -
Plum Pudding Model
Created by J.J Thomson in 1904, it suggested that the positive fluid in an atom held the negative charges, the electrons, in the atom because of electrical forces. -
Rutherford Model
The Gold Foil Experiment -
Robert Milikin
He created the oil drop expirement to determine the chage of an electron. -
Gold Foil Experiment
Created by Ernest Rutherford in 1911.
It discovered that the atom has a central nucleus surrounded by orbiting electrons. -
Henry Moseley
He discovered isotopes and improved the periodic table. -
Bohr Planetary Model
Proposed by Niels Bohr in 1915. It suggested that the nuetrons and protons orbit the nucleus. -
Law of Conservation of Mass
Created by Antoine Lavoisier. States that in a chemical reaction, the mass of the products equals the mass of the reactants. -
Ernest Rutherford
He was the first to establish the theory of the nuclear atom. He constructed the Gold Foil Experiment a,k,a the Rutherford Model. -
Electron Cloud Model
Created by Erwin Schrodinger in the 1920s. In this model it states that the elctrons do not have a specific spot in the arom. They are anywhere around the nucleus. -
Erwin Schrodinger
He developed a powerful model of the atom. -
Quantum Mechanical Model
Created by Erwin Schrodinger. It correctly defines the electrons movement with relation to the nucleus. -
James Chadwick
He determined that the nuetron did exist.
