feb 9, 1820 - Mendeleev Anonymous. Dimitri Mendeleev. Famous Scientists, 2017, https://www.famousscientists.org/dmitri-mendeleev/. Accessed Nov. 20, 2017 Anonymous, Building The Periodic Table of Elements, 2017, https://www.khanacademy.org/partner- content/big-history-project/stars-and- elements/knowing-starselements/a/dmitri-mendeleev. Accessed Nov. 20, 2017

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