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Sources used:
-Atom: Development of Atomic Theory - Infoplease. (n.d.). Retrieved October 20, 2016, from http://www.infoplease.com/encyclopedia/science/atom-development- atomic-theory.html
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-Elements - Lenntech. (n.d.). Retrieved October 20, 2016, from http://www.lenntech.com/periodic/elements/
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-Dynamic Periodic Table. (n.d.). Retrieved October 21, 2016, from http://www.ptable.com/
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-Chemicool - Periodic Table of Elements and Chemistry. (n.d.). Retrieved October 21, 2016, from http://www.chemicool.com/
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