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Atomic Theory

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Rodnalyn Sese

on 1 November 2012

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Transcript of Atomic Theory

ATOMIC THEORY Rodnalyn Sese
Period 3
October 17,2012 with Democritus It all started in the Greek era........ Antoine Lavoiser Then it was..... John Dalton J.J. Thomson Ernest Rutherford Niels Bohr Erwin Schrodinger James Chadswick Democritus's theory is that these atoms are all individually created and is not destructible no matter scientific procedure is done. http://democritusatomictheory.com/ Democritus is a greek
philosopher who first
suggested the idea of
atoms Antoine Lavoiser
is known to be
"The father of modern
chemistry" He discovered that water
can be made as oxygen and he found
the way to understand biochemistry
and metabolism. took ideas from Lavoiser's Atomic Theory http://www.chem.uic.edu/lavoisier.htm There are four things in Dalton's theory.
One is that all matters are made of tiny atoms, atoms are indestructible and it cannot be made, different elements have different types of atoms, and lastly, Chemical actions occur when atoms are rearranged. http://www.xtimeline.com/evt/view.aspx?id=630345 1789 1803 J.J. Thomson discovered
electrons in a sphere
of positive matter. He
made efforts to estimate
the number of electrons
in an atom. He was studying rays and this is how he got to discover electrons as rays were considered negatively charged particles. http://www.chemheritage.org/discover/online-resources/chemistry-in-history/themes/atomic-and-nuclear-structure/thomson.aspx His atomic theory is about how an atom has a positive central nucleus with electrons surrounding it. Also, he found that the rest of the atom is mostly empty space and this was discovered in his experiment where radioactive particles shot foil. http://www.rsc.org/chemsoc/timeline/pages/1911.html http://www.rsc.org/chemsoc/timeline/pages/1913.html Niels Bohr used Rutherford's atomic structure and he assumed that electrons travel in a stationary way around the positive nucleus. This led to theories of energy levels contained in electron movements. 1897 1911 1922 Enrico Fermi He is an Austrian
physicist who took Bohr's model and took
it to the next level. He used equations to find out the position of an electron. His atomic model is called quantum mechanical model. 1930 http://www.abcte.org/files/previews/chemistry/s1_p6.html 1932 He was the one who made a new atomic model that looked more complete than ever. He discovered the neutron and he proved Rutherford's orignal theory. It is now known that the neutron plays a major role within the atom. http://suite101.com/article/the-discovery-of-the-neutron-a46060 SOURCES Glen Seaborg He is a physicist who was
the first to have a
controlled chain reaction
releasing energy from the
atom's nucleus. He made a
"massive atomic pile"
and it was to seek for
energy. 1942 THE END http://www.nobelprize.org/nobel_prizes/chemistry/laureates/1951/seaborg-bio.html 1941 He discovered 6
transuranium elements
which changes the
layout of the periodic
table. He discovered the
identification of more than 100 isotopes of elements in the Periodic Table with his colleagues.
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