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Atom Theory

Published on Nov 18, 2015

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1.

Democritus

  • (460-370 BCE)
  • Hypothesis-held that everything is composed of atoms which are physical but not geometrical
Photo by Leo Reynolds
2.

ARISTOTLE

  • Aristotle didn't discover anything about atoms
  • Aristotle complete dismissed atomic theory.
  • He stuck with and promoted the idea that the universe was made from Earth, Air, Fire and Water.
  • (384 BC – 322 BC)[
Photo by ProLithic 3D
3.

Antonie Lavoisier

  • Antonie Lavoisier found the two elements that make up water.
  • He named one Oxygen
  • He named the other Hydrogen
  • August 6 1743 – 8 May 1794
Photo by Leo Reynolds
4.

John Dalton

  • He also tried to come up with the atomic stuructures of atoms.
  • (6 September 1766 – 27 July 1844)
Photo by gnackgnackgnack
5.

John Dalton

  • developed the Atomic Theory in 1800
  • He still believed that the atom was the smallest unit of matter
  • also tried to calculate the atomic weight of compounds
  • He also tried to come up with the atomic stuructures of atoms.
  • (6 September 1766 – 27 July 1844)
Photo by gnackgnackgnack
6.

Marie and Pierre Curie

  • On Dec 21 1898 isolated a new element that came to be called radium
  • a landmark moment in chemistry and physics.
  • Husband and wife team Marie and Pierre Curie
  • laid the cornerstone of the nuclear age
  • Found the things used for x-rays today!
Photo by Karen Roe
7.

HENRI BECQUEREL

  • discovered uranium produced x-ray radiation.
  • Which led him to discover radioactivity
  • All this happened as he was investigating phosphorescence
  • (15 December 1852 – 25 August 1908)
Photo by Leo Reynolds
8.

JJ Thompson

  • discovered the electron using cathode-ray tube
  • 1901
  • thought the atom was a sphere of energy as he was investigating phosphorescence
  • with electrons around it
  • plum pudding model
Photo by gnackgnackgnack
9.

Max Planck

  • found the quantum theory
  • The Quantum theory statesIn 1900 Max Planck made a profound discovery in modern physics
  • He showed that light must be emitted and absorbed in discrete amounts
  • Jan 1900
Photo by MohammadHasan
10.

ROBERT MILLIKAN

  • was responsible for finding the charge of a single electron
  • did this using his oil drop expirement
  • He proved that subatomic particles do exsist.
  • is also credited with proving einstein. he did this by using the Photoelectric effect.
  • Jan, 1908
Photo by MohammadHasan
11.

Ernest Rutherford

  • discovered the nucleus.
  • theory was the atom has a positive nucleus with negative electrons orbiting around it
  • changed the atom greatly
  • Jan 1911
Photo by ProLithic 3D
12.

NIELS BHOR

  • proposed a new atom model that would allow the electrons to be outside the nucleus and in orbit
  • around the nucleus
  • said the electrons were on a special orbit
  • model is knowen as the Bhor Model
  • 1st Jan, 1913
Photo by gnackgnackgnack
13.

HENRY MOSELY

  • Henry Mosely found the relatinship between wavelengths
  • x-rays produced, and the atomic number of a metal. His finding became knowen as Mosely's Law.
  • 1913
Photo by kaihm
14.

Ewrin Schrodinger

  • Ewrin Schrodinger came up with the equation for quantum wave mechanics.
  • His equation was the the second theory or explanation for the reason electrons move when in an atom
  • 1926
Photo by Karen Roe
15.

WERNER HEISENBERG

  • came up with the uncertainty priciple
  • the uncertainty principle says that you cant measure the current position of a particle and also measure the position it will be in after it moves
  • 1927
Photo by Leo Reynolds
16.

JAMES CHADWICK

  • proved the exsistence of neutrons
  • This affected the atom model greatly because another subatomic particle was found in the atom.
  • 1932
Photo by Leo Reynolds

Mykah Stone