Valence shell electron pair repulsion (VSEPR) theory is a
model used, in
chemistry, to predict the geometry of individual
molecules from the number of electron pairs surrounding their central atoms. It is also named
Gillespie–Nyholm theory after its two main developers. The acronym "VSEPR" is pronounced either "
ves-per" or "vuh-
seh-per" by some chemists.