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The History of the Atom

Chemistry Pre-AP 1st Period

Victoria Gonzales

on 9 October 2012

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Transcript of The History of the Atom

Aristole Democritus of Adbera J.J. Thomson Ernest Rutherford Niels Bohr John Dalton Louis deBroglie Werner Heisenberg (460-370 B.C.) (1766-1844) (1856-1940) Won the Adams Prize in 1884 for his Treatise on the Motion of Vortex Rings
Discovered the electron (plum pudding model)
Cathode Ray Tube Experiment Robert Millikan Max Planck Stephanie
Goris Victoria Gonzales (384-322 BCE) James Chadwick (1891-1974) Erwin Schrödinger The Plum Pudding Model was created
by Thomson showing the electrons as
the "plum-like" circles and the rest of the
circle as the positivley charged "pudding." 1871-1937 1887-1961 1885-1962 1892-1987 1901-1976 1868-1953 1858-1947 He was Langworthy professed of the University of Manchester
Discovered the nucleus
Gold foil experiment:
shot alpha rays at a piece of gold foil
Moved to Berlin to work in the Physikalisch Technische Reichsanstalt at Charlottenburg under Professor H. Geiger
Proved the existence of neutrons
He bombarded the alpha rays on Beryllium atom Millikan got his masters in physics and was appointed Fellow in Physics at the University of Columbia
Oil Drop Experiment
Discovered the mass & charge of the electron Gold Foil
Experiment He was taught by Leucippus who probably initiated his theory
He proposed the idea of the atom
He contemplated what the smallest part of matter is
Theory: Atomic Theory Attended the Academy of Plato for twenty years
He developed the theory that all matter is made up of four elements: Earth, Air, Water, and Fire
He didn't think the old Greek theory of the atom was valid therefore he challenged it
Proposed the Aristole Atomic Theory Before Discovery:
Studied at the Universities of Munich and Berlin
Taught by Kirchhoff
and Helmholtz
Earned his doctorate of
philosophy at Munich
in 1879.
Planck’s Constant
The Quantum Theory History of the Atom He taught in Manchester where he joined the Manchester Literary and Philosophical Society that allowed him to have a good environment for thinking and creating.

Discovered: The Law of Multiple Proportions/Dalton’s Law
He calculated atomic weight and
percentage composition of
compound Cathode Ray Tube
Experiment Plum Pudding Model The End He earned his degree and then a
science degree three years later.
He discovered the wave nature of electrons.
He did this by firing of slow moving electrons at a crystalline nickel target. Studied physics at the
university of Munich
He discovered the
Heisenberg Uncertainty
Principle: It's impossible to measure the velocity and position of an electron at the same time. Earned a mastery at Eigenvalue
After Eigenvalue problems in the physics of continues media
"The Thought Experiment"
Schrodinger published a paper on Wave Mechanics which allowed him to develop:
- "Schrodinger's Equation." Neils Bohr further added on to finding an atoms structure
He also proved Ernest Rutherford's theory wrong Quantum Mechanical Model
(The Cloud Model) Indivisible/Solid
Sphere Model Nucleus Orbits The Planetary model The Nuclear Model Helium Matter as Waves The Uncertainty Principle Impossible to Know Exactly:
Where Something Is
How Fast it is Going Oil drop experiment where
Full transcript