Atomic Theory Timeline
Published on Nov 26, 2015
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PRESENTATION OUTLINE
DEMOCRITUS
- He adopted the atomic theory.
- All matter consists of invisible particles called atoms.
- Atoms are indestructible.
Photo by Ian W Scott
J J THOMSON
- Discovered the electron
- Cathode rays were negatively charged
- Discovered posotivly charged particles in neon
JOHN DALTON
- All matter is made of atoms
- Atoms are indivisible
- A chemical reaction is a rearrangment of atoms
Photo by Bolckow
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
CATHODE RAY TUBE
- Device that controlls electic current in a vacuum
- Rely on thermionic emission
- Visible light from florescent material
Photo by pardo_bsso
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
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
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
ROBERT MILLIKAN
- Determined the electric charge by a single electron
- Cosmic rays
- Served on the board of trustees
Photo by Cea.
NIELS BOHR
- Danish physicist
- Developed the bohr model
- Founded the institute of theoretical physics
Photo by coebabelghoti
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
DALTONS ATOMIC THEROY
- All matter is made of atoms
- Atoms are indivisible
- Atoms are indestructible
Photo by kevin dooley
QUANTUM MECHANICAL MODEL
- Based on mathematics
- Used to explain observations of complex atoms
- Based on quantum theory
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
ERNEST RUTHERFORD
- Discovered the radioactive halflife
- Beta radiation
- Gold foil experiment
Photo by dullhunk
DMITRI MENDELEEV
- Formulated the periodic law
- Created hos own version of the periodic table
- Russian chemist
Photo by Elliot Li
HENRY MOSELEY
- Established thecatomic number
- Nucleus contains posotive nuclear charges
- Xray spectra
Photo by addedentry
