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History of the Atom

timeline of the history of the atom
by

Lauren Petersen

on 10 February 2015

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Transcript of History of the Atom

Atoms are thought about
Atoms are discovered
J.J. Thompson, an English physicist, discovered negatively charged electrons in his cathode ray experiments
Democritus- Atomic Philosophy
Democritus, a Greek philosopher, suggested the existance of small, indivisible and indestructible pieces of matter, , which he called "atomos"
500 B.C.
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History of the Atom
Dalton-
Atomic Theory
1800
2000
1900
1700
John Dalton, an English chemist and schoolteacher, ran experiments and explained his observations of atoms.
Dalton's atomic theory:
1. All elements are composed of tiny indivisible particles called atoms
2. Atoms of the same element are identical.
3. Atoms are not created, destroyed of subdivided.
4. In chemical reactions, atoms of one element combine with atoms of another to form compounds
5. We can tell atoms of different elements apart by mass.
Electrons are discovered
Chadwick-
Neutron
J.J. Thompson-
electrons
Robert Millikan-
charge of electron
Ernest Rutherford performed his famous 'gold foil experiment, and discovered the nucleus
Rutherford-
Nucleus
Schrodinger:
Electron Cloud Model
Bohr
Planetary model
//
Nucleus is discovered
Bohr, a Danish physicist, proposed an electron is found only in specific circular paths, or energy levels
Louis de Broglie- Electrons are wave-like
1926
1913
1897
1911
Erwin Schrodinger, an Austrian physicist, developed a mathematical equation to predict location of an electron
Time-independent Schrödinger equation (general)
Full transcript