How can you use the VSEPR theory?
Note: answer may be lacking due to what I am required to know for my school course.
The valence shell electron repulsion theory relies on the basis that since electrons are negatively charged subatomic particles, the pairs of electrons will repel each other to be as far apart as possible in space. These pairs may be electron domains or bonds.
The VSEPR theory can also help with the deduction of bond angles between bonds on the same atom. If there are 2 pairs of electrons the linear shape would form, thus creating the bond angle
If there are three bonds the molecular or electron domain geometry would be trigonal planar , with the bond angle being
If there are four bonds a tetrahedral shape would form, with the bond angle being
Other shapes for molecular geometry include:
4. trigonal pyramidal
5. trigonal bipyramidal
8. t shaped
9. square based pyramid
10. square planar
The bond angles will vary depending on whether it is bonds that are present or non-bonded electron domains. In general the non-bonded electron domains will have a stronger repulsive force than the bonds.
Bylikin, Sergey, Gary Horner, Brian Murphy, and David Tarcy. Chemistry: Course Companion. Oxford: Oxford UP, 2014. Print.