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WHAT IS VALENCE SHELL ELECTRON PAIR REPULSION THEORY(VSEPRT)?EXPLAIN BRIEFLY ABOUT IT WITH EXPLANATION.

@ nunetha 
VSEPR is a theory given by pauling , to predict the shapoe and hybridisation of a molecule . 
acc to it , its the electron which are present in a valence shell of an atom , will determine the shape of molecule . 
actually what happens  , when two or more atom will combine , they will form a molecule , when combine the valence shell electron will repel each other and if repulsion will be greater that will change the bond angle , and thus structure will be affected , 
but it was discarded later beacuse it cannot explain the magnetic nature of O2 , 

hope it clears 
all the best