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Atomic Models. The Greeks. Ancient Greeks – Naturalism, a physical explanation for phenomenon. Democritus – In 450 BC proposed atoms, particles that could not be further divided. Aristotle – Earth, Air, Water, Fire. Aristotle, just remember … Earth, Wind, and Fire (& Water).

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The greeks

The Greeks

  • Ancient Greeks – Naturalism, a physical explanation for phenomenon.

  • Democritus – In 450 BC proposed atoms, particles that could not be further divided.

  • Aristotle – Earth, Air, Water, Fire.


Aristotle just remember earth wind and fire water

Aristotle, just remember…Earth, Wind, and Fire (& Water).

Do you rememberthe 21st night of September?Love was changing the minds of pretenderWhile chasing the clouds awayOur hearts were ringingIn the key that our souls were singing.As we danced in the night rememberhow the stars stole the night awayBa de ya - say do you rememberBa de ya - dancing in SeptemberBa de ya - never was a cloudy day


John dalton

  • Lived from 1766 - 1844

  • Believed atoms had no internal structure.

  • Atoms differ only in mass and size.

  • Looks like… (Think spheres).

John Dalton


J j thomson

  • Lived from 1856 - 1940

  • Atoms are divided into p+ and e-.

  • Atoms have an internal structure.

  • Looks like… (Think ‘plum pudding’).

J.J. Thomson


Ernest rutherford

  • Lived from 1871 - 1937

  • Atoms have a nucleus containing p+.

  • e- moved around the nucleus.

  • Looks like… (Think ‘planets’).

Ernest Rutherford



James chadwick

  • Lived from 1891 - 1974

  • Nucleus also contains no, neutrons

  • no prevent atoms from splitting up by increasing the strong force without increasing the charge in the nucleus.

  • Looks like… (Think ‘neutrons’).

James Chadwick


Neils bohr

  • Lived from 1885 - 1962

  • Electrons have distinct energy levels or shells around the nucleus.

  • Looks like… (Think ‘electron shells’).

Neils Bohr


Nucleus

Nucleus

  • Each has its own counterpart (e.g. antiparticle of an electron is a positron).

  • When particles collide with their antiparticle, they annihilate each other, releasing vast amounts of energy at a subatomic level.

  • When a positron and electron collide they produce one million electron volts of energy (MeV = 1.6 x 10-13 joules).


Electron e

Electron, e-


Proton p

  • 1840 times heavier than an e is roughly 10- (1.67 x 10-24 grams).

  • The number of p+ equals the number of e- to insure the stability of an atom.

Proton, p+


Neutrons n o

  • Has no electrical charge. is roughly 10

  • Essentially the same mass as a p+ (1.67 x 10-24 grams).

  • no ’s prevent the nucleus from splitting apart.

Neutrons, no


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