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Atomic Theories

Science knowledges changes over time. Here we look at a series of shifts in our understanding of the atom.
by

Melissa Holterman

on 28 January 2013

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Transcript of Atomic Theories

Atomic Theories Science Knowledge Changes Over Time John Dalton's Atomic Theory Changes
"Particles" are called atoms.
Atoms are indivisible JJ Thomson's cool experiment He created the Gas Discharge Tube. JJ Thomson's Theory The atom was a positive sphere with electrons
in it! (The sphere had to be positive to cancel
out the charge of the electrons) Some other developments... X-Rays and radioactivity are
discovered.
RIP Marie Curie. Showed that a ray was being emitted when you hooked this up to electricity... it had a negative charge and it had mass. They called it a stream of ELECTRONS http://highered.mcgraw-hill.com/olcweb/cgi/pluginpop.cgi?it=swf::100%::100%::/sites/dl/free/0072512644/117354/01_Cathode_Ray_Tube.swf::Cathode Ray Tube Ernest Rutherford's cool
experiment (Positive "rays" emitted.)
What did he expect to happen, based on Thomson's model? Ernest Rutherford proved... A positive particle must exist!
The PROTONS must be contained in a small space, which he called the NUCLEUS. Other developments... http://chemmovies.unl.edu/ChemAnime/RUTHERFD/RUTHERFD.html Chadwick discovered the
NEUTRON, (using another
cool experiment that won't be
discussed here) a neutral particle in the nucleus. Neils Bohr's cool thought
experiment... Why don't electrons get attracted to the
nucleus?
* Because they move at specific speeds, in
specific regions, like the planets around the
sun. He called these regions ELECTRON
SHELLS. What's Next??

Haha, take chemistry
grade 12 to find out! 1808 1890s 1903 1911 1932 1913
Full transcript