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First of all, how do polar bonds cancel each other?? An easy example would really help alot :D And in the case of hybrid orbitals, how does hybrid orbitals with BeF2 work out? Could anyone explain the concept of this hybrid orbital and how really BeF2 forms a bond, though Be doesnt have any...

I'm not quite sure how to determine bond angles in molecular geometry from a formula or a lewis dot structure. My textbook suggests to use species type such as AX2 , AX3E, and I'm not sure how to use them. Is there an easier way to use these types? If not, how do you determine bond angles less...