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Antoine Lavoisier
He used this experiment to help himself come up with the Law of Conservation. The law states that matter cannot be made or destroyed.
http://historyoftheatomictheory.weebly.com/antoine-lavoisier.html -
Joseph Louis Proust
"Proust stated the Law of Definite Proportions. The law states that the ratio of elements in a compound is always the same/constant. he also set up for Dalton to create the Law of Multiple Proportions and ultimately his Atomic Theory."
http://historyoftheatomictheory.weebly.com/joseph-proust.html -
John Dalton
he compiled it into what we call Dalton's Theory. His theory contained 6 parts:
1.matter is composed of extremely small particles called atoms
2.atoms are indivisible and indestructable
3.atoms of a given element are identical in size, mass, and chemical properties
4.atoms of specific elements are different thatn those of other elements
5.in a chemical reaction, atoms separate, combine and/or rearrange
http://historyoftheatomictheory.weebly.com/john-dalton.html -
Michael Faraday
Studied the effect of electricity on solutions.splitting of molecules with electricity, developed laws of electrolysis
http://atomictimeline.net/index.php -
J.J Thomson
Thomson found the electron in a sereies of experiments. " Thomson suggested a model of the atom as a sphere of positive matter in which electrons are positioned by electrostatic forces"
http://www.chemheritage.org/discover/online-resources/chemistry-in-history/themes/atomic-and-nuclear-structure/thomson.aspx -
Robert Millikan
Studied the charge of electrons by doing a series of experments. proved Thomson's hypothesies that there is a charge to mass ratio.
http://chemed.chem.purdue.edu/genchem/history/millikan.html -
Henri Becquerel
discovered some chemicals spontaneously decompose and give off very pentrating rays. -
Marie Curie
Studied uranium and thorium and called their spontaneous decay process "radioactivity". -
Max Planck
used the idea of quanta to explain hot glowing matter.
http://atomictimeline.net/index.php -
Albert Einstein
Published the famous equation E=mc 2.
http://atomictimeline.net/index.php -
Ernest Rutherford
gold foil experiment led him to find there was something in the center of the atoms, called the nucleus. This led to his nuclear model of an atom. -
Niels Bohr
His atomic model had atoms built up of sucessive orbital shells of electrons. -
Louis DeBroglie
Discovered that electrons had a dual nature-similar to both particles and waves. Particle/wave duality. Supported Einstein.
http://atomictimeline.net/index.php -
Ernest Schrodinger
took the Bohr atom model one step further.Schrödinger used mathematical equations to describe the likelihood of finding an electron in a certain position. This atomic model is known as the quantum mechanical model of the atom.
http://www.abcte.org/files/previews/chemistry/s1_p6.html -
James Chadwick
discovered a neutral atomic particle with a mass close to a proton. Thus was discovered the neutron. -
Otto Hahn / Lisa Meitner
discovered spliting of the atom "Fission". https://prezi.com/skl2hfn22rae/the-atomic-theory-otto-hahn/ -
Glen T. Seaborg
Synthesized 6 transuranium elements and suggested a change in the layout of the periodic table.
http://atomictimeline.net/index.php
