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Chemistry Lesson 1 Atomic and Molecular Structure (Grades 9-12) Instruction 1-2 How to Identify Metals, Semimetals, Nonmetals, and Halogens http://www.chemtutor.com/perich.htm#mls (Read Metals, Semi-Metals, Non-Metals) http://www.chemicalelements.com/groups/halogens.html (Information about halogens) http://www.chemicalelements.com/groups/halogens.html |