Chemistry Lesson 1
Atomic and Molecular Structure (Grades 9-12)

Instruction 1-7

Size and Mass

http://www.fordhamprep.com/gcurran/sho/sho/lessons/lesson36.htm  (Detailed explanation)
http://chemed.chem.purdue.edu/genchem/topicreview/bp/ch6/quantum.html  (Detailed explanation)

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