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The History Of The Atom by Larissa

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Lary Larissa

on 1 November 2012

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Transcript of The History Of The Atom by Larissa

The History of the Atom Democritus John Dalton G. J. Stoney Sir William Crookes J. J. Thomson Greek Era all matter is made of atoms
atoms are eternal and very small
empty space exists between the atoms
"by convention bitter, by convention sweet, but in reality atoms and voids" (Democritus) Aristotle the founder of modern chemistry
said that an element as a simple substance that could not be broken down into simpler substances by any known chemical process
proved the conservation of mass in a chemical reaction suggested that there were four elements: water, fire, earth, air
said that the four elements had four properties: hot, cold, try and wet. 1777-1803 ? The knowledge about atoms will surely develope in future. And who knows maybe you will be the next great sientist! 1869-1874 1874-1897 1903-1909 1911-1922 1930-1932 all matter is made of atoms
atoms of the same element are identical.
Atoms can not be created and destroyed.
Atoms of different elements can be told apart by their weights and chemical properties.
law of multiple proportions: During chemical reactions different atoms combine in simple whole numbers to form compounds Dmitri Mendeleev created the first version of the periodic table
Periodic law: “the principle that chemical properties of the elements are periodic functions of their atomic numbers (worfnetweb.princeton.edu)” suggested that electrons, negatively charged particles, made up electricity
build the foundation for J. J. Thomson Invented the a Crookes tubes (an apperatus I which electrons are speeds up and shots out of the cathode so they appear as a beam)
conducted many experiments with cathode rays.
Later scientists made the television picture tube out of his invetion Showed that the rays from Sir William Crookes cathode pump were made of particles
Found out that the cathode rays from the pump are negatively charged by exposing them to a magnetic field
Discovered that the ration of charge to mass of the negatively charged particles was 108 Coulomb per gram no matter what materials were used
concluded that the extremely light negatively charged particles he had discovered were in every atom
Created the Raisin Pudding Model of the atom Hantaro Nagaoka Robert Andrews
Millikan Created the planetary model of the atom based on the Saturn and the rings of its orbiting plantes Conducted the oil-drop experiment
Discovered the charge of an electron
proved that the mass of an electron is 1000 times smaller than the smallest atom Ernest Rutherford Niels Bohr Conducted the gold foil experiment
Discovered that most of the mass and the positive charge were in a small volume at the center of the atom
named the positive charged center of the atom nucleus said that electrons rotate around the nucleus in larger circles called orbits
suggested that the outer orbits had more electrons than the smaller inner orbits
stated that when electrons change their orbit they produce light energy
called his model the planetary model of the atom Erwin Schrodinger James Chadwick calculated the possible location of electrons in atoms and checked which were most frequent
proves that mathematically electrons behave similar to waves
created a model of the atom with the probability of the location of the electron -discovered the neutron
neutrally charged particle
same mass as proton
in the nucleus
-created a new model of the atom with neutrons Antoine Lavoisier Oil-drop Experiment Gold Foil Experiment BIBLIOGRAPHY of Videos, Pictures and Information
History of the Atom paper from moodle (History of the Atom webquest http://www.needham.mec.edu/High_School/teacher_pages/hirsh/atom/atom-w.html (accessed Feb 2003))
"Development of the Atom." Oracle Education Foundation. ThinkQuest, August 25, 2010. Web. 9 Mar 2011. <http://library.thinkquest.org/C006669/data/Chem/atomic/development.html>.
Pictures and Information: Martin, Michael. "A Timeline of the Atom." Angelfire. N.p., n.d. Web. 9 Mar 2011. <http://www.angelfire.com/mb2/atoms/>
Pictures and Information: "Atomic Model Timeline." People. Tripod, September 21, 2009. Web. 9 Mar 2011. <http://craigjm.tripod.com/physics.html>.
Videos from youtube: Oil drop experiment video: http://www.youtube.com/watch?v=XMfYHag7Liwgold foil experiment video: http://www.youtube.com/watch?v=5pZj0u_XMbc
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