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...Advanced higher chemistry cfe unit inorganic lesson valence shell electron pair repulsion vsepr theory ii read through the notes you can write them out print or save once have tried to understand answer questions that follow at end answers question sheet s will be posted later and this allow self evaluate your learning intentions learn about effect of lone pairs on bond angles basic molecules shapes polyatomic ions background builds i looks specifically following three examples methane ammonia water are useful illustrate how bonded electrons interact with alter shape ch all h x cxx molecule tetrahedral angle carbon has outer number hydrogen atoms non bon there only bonding is an even degree between which creates a nh trigonal pyramidal one so slightly more causes bonds push together therefore it also convenient represent in way important but both o angular bent two cause lot greater extent reduces note above each however point different according interactions alters tells us surround c...