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He thought that all materials on Earth were not made of atoms, but of the four elements, Earth, Fire, Water, and Air. He believed all substances were made of small amounts of these four elements of matter. https://the-history-of-the-atom.wikispaces.com/Aristotle
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Father of the atom. Believed that all things consisted of indivisible units called atoms. http://www.barcodesinc.com/articles/timeline-on-atomic-structure.htm
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Discussed the probability of atoms existing. He proposed that elements are composed of 'corpuscles' of various types and sizes that are able to organize themselves into groups that represent different chemical substances. http://historyoftheatomictheory.weebly.com/robert-boyle.html
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Proposed a mechanical universe where small solid masses were in motion. Believed that there were pieces of that were "swimming" everywhere. http://atomictimeline.net/index.php
http://www-gap.dcs.st-and.ac.uk/~history/Mathematicians/Newton.html -
Developed 1st atomic theory - Billiard Ball Model. Elements consisted of atoms. All atoms of an element are identical. Atoms of each element are different from one another. Compounds consisted of atoms are different elements combined together. Chemical reactions involved the rearrangement of combinations of those atoms. http://www.barcodesinc.com/articles/timeline-on-atomic-structure.htm
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Formulated the law that a gas expands lincarly with a fixed pressure and using temperature http://www.newworldencyclopedia.org/entry/Joseph_Louis_Gay-Lussac
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Studied the effect of electricity on solutions, coined term "electrolysis" as splitting of molecules with electricity. http://atomictimeline.net/index.php
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He built the first Cathode Ray tube. These are used to make X-Rays. http://atomictimeline.net/index.php
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Periodic law. First periodic table in 1869. Discovered that the properties of elements "were periodic functions of the their atomic weights". http://atomictimeline.net/index.php
http://www.barcodesinc.com/articles/timeline-on-atomic-structure.htm -
Proposed the electomanetic theory - proposed that electic and magnetic fields filled the void http://www.geog.ucsb.edu/~jeff/115a/history/jamesclarkemaxwell.html
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Experiments with cathode-ray tubes led him to confirm the work of earlier scientists by definitively demonstrating that cathode-rays have a negative charge. http://atomictimeline.net/index.php
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Plum Pudding model. Discovered the electron. Described atoms as ball of positive charge containing a number of electrons http://atomictimeline.net/index.php
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Discovered radium and polonium and coined the radioactivity after studying the decay process of aranius and thorium http://www.barcodesinc.com/articles/timeline-on-atomic-structure.htm
http://www.staff.amu.edu.pl/~zbzw/ph/sci/msc.htm
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Postulated a "Saturnia made of the atom with flat rings of electrons revolving around positively charged particle http://atomictimeline.net/index.php
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Conducted Aluminum Foil Experiment. Found that a beam of electrons was able to pass through a sheet of aluminum foil with almost no deflection. Concluded that most of an atom's volume is just empty space. http://www.nobelprize.org/nobel_prizes/physics/laureates/1905/lenard-facts.html
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Found that inert gases have a stable electron configuration http://www.barcodesinc.com/articles/timeline-on-atomic-structure.htm
http://atomictimeline.net/index.php
http://www.chemistry.mtu.edu/~pcharles/SCIHISTORY/08nuclearatom.html -
Published the famous equation E=mc2. Created the Quantum Theory of Light - the idea that light exists as tiny particles called photons. http://atomictimeline.net/index.php
http://www.aip.org/history/einstein/ -
Discovered that the number of protons in an element determines its atomic number http://atomictimeline.net/index.php
http://www.barcodesinc.com/articles/timeline-on-atomic-structure.htm -
Discovered the existence of isotopes through the use of a mass spectrograph. http://atomictimeline.net/index.php
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He's the Father of Quantam theory, Proposed that the atom is succesive or bital shells of electrons. Bohr came up with the "Bohr Planetary Model." http://atomictimeline.net/index.php
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Discovered that electrons had a dual nature similar to both particles and waves. Particle/wave duality http://www.barcodesinc.com/articles/timeline-on-atomic-structure.htm http://www.colorado.edu/physics/2000/quantumzone/debroglie.html
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He is the father of nucleus physics. He developed the "gold foil experiment." Rutherford deteremined that the nucleus of an atom is very dense and has a positive charge. http://atomictimeline.net/index.php
http://www.rutherford.org.nz/ -
Proposed the "Electron Cloud Theroy." Identified the electron cloud as the propable location of moving particles. http://atomictimeline.net/index.php
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Described atoms by means of formula connected to the frequencies of spectral lines. Proposed Principle of Indeterminancy "you can't know both the position and velocity of a particle. http://atomictimeline.net/index.php
http://www.aip.org/history/heisenberg/p01.htm -
Proposed the first theory of the existance of anti-particles http://www.barcodesinc.com/articles/timeline-on-atomic-structure.htm
http://www.magnet.fsu.edu/education/tutorials/pioneers/dirac.html -
Proved the existance of the neutron. He discoverd a particle within the nucleus that has a mass similar to that of a proton. http://atomictimeline.net/index.php
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He invented the cyclotron and recognized the potential for medical isotopes. Isotopes are used to make medicines. When radioactive isotopes are introduced to the body, they give off an energy or radiation that can be tracked by imaging equipment. http://www.chemistryexplained.com/Kr-Ma/Lawrence-Ernest.html
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Discovered eight transuranrum elements http://atomictimeline.net/index.php
http://www.barcodesinc.com/articles/timeline-on-atomic-structure.htm
http://www.osti.gov/accomplishments/seaborg.html -
Created the 1st man-made nuclear reacter http://atomictimeline.net/index.php
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Came up with the term isotope to explain the unintentianal of radioactive elements. http://atomictimeline.net/index.php
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Discovered canal rays, which have a positive charge equal to an electron. http://www.columbia.edu/itc/chemistry/chem-c2507/navbar/chemhist.html
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