- http://chemistry.about.com/od/k12gradelessons/a/periodictable.htm
- http://chemistry.about.com/library/blperiodictable.htm
- http://chemistry.about.com/od/elementfacts/a/elementsymbols.htm
- http://chemistry.about.com/od/periodictableelements/a/liquidelements.htm
- http://chemistry.about.com/library/weekly/aa030103a.htm
- http://chemistry.about.com/od/periodictableelements/a/liquidelements.htm
- http://chemistry.about.com/lr/element_facts/260819/2/
Sunday, August 28, 2011
chemistry
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