MOC 21: Elements

Help/Sources:
* https://www.boundless.com/chemistry/textbooks/boundless-chemistry-textbook/introduction-to-chemistry-1/classification-of-matter-27/elements-and-compounds-180-10544/?
* http://www.ausetute.com.au/elements.html

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S-O Science
Sibley-Ocheyedan High School
Sibley, IA

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