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Stacy, Angelica M., Janice A. Coonrod, and Jennifer Claesgens. Living by Chemistry. Emeryville, CA: Key Curriculum, 2010. Print.
Chow, Denis. "The Universe: Big Bang to Now in 10 Easy Steps." www.space.com. N.p., 18 Oct. 2011. Web. 6 Jan. 2014.
Coffey, Jerry. "Democritus Atom." Universe Today RSS. N.p., 22 Mar. 2010. Web. 06 Jan. 2014.
Dandona, Gunitika. "Atomic Mass." Atomic Mass. Chemwiki, n.d. Web. 08 Jan. 2014.
De Leon, N. "Dalton's Atomic Theory." Dalton's Atomic Theory. N.p., n.d. Web. 04 Jan. 2014.
Freudenrich, Craig. "How the Periodic Table Works." HowStuffWorks. N.p., n.d. Web. 03 Jan. 2014.
"J.J. Thomson - Biographical". Nobelprize.org. Nobel Media AB 2013. Web. 7 Jan 2014.
Kramer, Melody. "The Physics Behind Schrödinger's Cat Paradox." National Geographic. National Geographic Society, 12 Aug. 2013. Web. 06 Jan. 2014.
"Niels Bohr." PBS. PBS, n.d. Web. 07 Jan. 2014.
Park, John L. "Moseley and Atomic Number." Moseley and Atomic Number. Moseley's Discovery, 1999. Web. 03 Jan. 2014.
"The Periodic Table." The Periodic Table. Western Oregon University, 1997. Web. 03 Jan. 2014.
"Joseph John Thomson." Homepage of the Chemical Heritage Foundation. The Berndt Group, June 2010. Web. 05 Jan. 2014.
Rogers, Elizabeth. "Law of Conservation of Mass." Fundamentals of Chemistry. N.p., n.d. Web. 05 Jan. 2014.
"Rutherford - Atomic Theory." Rutherford - Atomic Theory. N.p., n.d. Web. 04 Jan. 2014.
Stacy, Angelica M., Janice A. Coonrod, and Jennifer Claesgens. Living by Chemistry. Emeryville, CA: Key Curriculum, 2010. Print.