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Atomic Theory Timeline

Published on Nov 26, 2015

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PRESENTATION OUTLINE

1.

DEMOCRITUS

  • He adopted the atomic theory.
  • All matter consists of invisible particles called atoms.
  • Atoms are indestructible.
Photo by Ian W Scott
2.

J J THOMSON

  • Discovered the electron
  • Cathode rays were negatively charged
  • Discovered posotivly charged particles in neon
3.

JOHN DALTON

  • All matter is made of atoms
  • Atoms are indivisible
  • A chemical reaction is a rearrangment of atoms
Photo by Bolckow
4.

GOLD FOIL EXPERIMENT

  • Scientists discovered every atoms contains a nucleus that is positively charged
  • Measured how an alpha particle beam is scattered
  • Performed between 1908 and 1913
Photo by FearfulStills
5.

CATHODE RAY TUBE

  • Device that controlls electic current in a vacuum
  • Rely on thermionic emission
  • Visible light from florescent material
Photo by pardo_bsso
6.

ANTOINE LAVOISIER

  • French chemist
  • Formulated a theroy of chemical reactivity of oxygen
  • Co wrote the modern system for the nomenclature of chemical substances
Photo by leoncillo sabino
7.

PLUM PUDDING ATOMIC MODEL

  • Model of the atom that incorporated the recently discovered electron
  • Proposed by j. J. Thomson in 1904
  • Electrons were thought to be positioned throughout the atom
Photo by Mr. Ducke
8.

BOHR PLANETARY MODEL

  • Used as a symbol for atomic energy
  • Protrons and neutrons are the red and blue balls.
  • Nucleus is 100,000 x smaller than the radius of the entire atom
Photo by A Guy Taking Pictures
9.

ROBERT MILLIKAN

  • Determined the electric charge by a single electron
  • Cosmic rays
  • Served on the board of trustees
Photo by Cea.
10.

JAMES CHADWICK

  • Discovered the neutron
  • Liverpool university
Photo by arwriterphotog
11.

ERWIN SCHRODINGER

  • Quantum theory
  • Formulated the wave equation
  • Wave function
Photo by Bradley Wind
12.

NIELS BOHR

  • Danish physicist
  • Developed the bohr model
  • Founded the institute of theoretical physics
Photo by coebabelghoti
13.

LAW OF CONSERVATION OF MASS

  • Matter can be changed from one form to another
  • Mixtures can be separated or made
  • Pure substances can be decomposed
Photo by biologycorner
14.

DALTONS ATOMIC THEROY

  • All matter is made of atoms
  • Atoms are indivisible
  • Atoms are indestructible
Photo by kevin dooley
15.

RUTHERFORD MODEL

  • Atom devised by ernest rutherford
  • Central volume
  • Atomic mass
Photo by dullhunk
16.

QUANTUM MECHANICAL MODEL

  • Based on mathematics
  • Used to explain observations of complex atoms
  • Based on quantum theory
Photo by UCL Mathematical and Physical Sciences
17.

ELECTRON CLOUD MODEL

  • History of where the electron has been
  • Red dot is nucleus
  • Moves around and resembles a cloud
Photo by deege@fermentarium.com
18.

ERNEST RUTHERFORD

  • Discovered the radioactive halflife
  • Beta radiation
  • Gold foil experiment
Photo by dullhunk
19.

DMITRI MENDELEEV

  • Formulated the periodic law
  • Created hos own version of the periodic table
  • Russian chemist
Photo by Elliot Li
20.

HENRY MOSELEY

  • Established thecatomic number
  • Nucleus contains posotive nuclear charges
  • Xray spectra
Photo by addedentry

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