Posted by chemistry on Wednesday, January 25, 2012 at 6:55pm.
Read about VSEPR theory
http://www.google.com/search?q=vsepr+theory&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a
thx
but wat is a good way to remember it
Practice it enough that you have it memorized.
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