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Sorces
"Periodic Table." – Royal Society of Chemistry. N.p., n.d. Web. 18 Nov. 2014
"History of the Periodic Table of the Elements." Chemistry Tutorial : History of the Periodic Table. N.p., n.d. Web. 18 Nov. 2014.
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"Periodic Table." – Royal Society of Chemistry. N.p., n.d. Web. 18 Nov. 2014
"History of the Periodic Table of the Elements." Chemistry Tutorial : History of the Periodic Table. N.p., n.d. Web. 18 Nov. 2014.