you can go to this website for further details. if really don't understand can find me I'm free.
http://chemistry.about.com/od/chemistrystudentfaqs/f/bondtypes.htm jyjy !
http://www.authorstream.com/Presentation/WoodRock-37270-elements-compounds-mixtures-Matter-Fact-Why-isnt-good-idea-classify-phase-as-Education-ppt-powerpoint/ << from friend de.
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