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Valence shell electron pair repulsion, VSEPR, is a super-simple technique for predicting the geometry of atomic centres in small molecules and molecular ions:Carbon in methane, CH4 Nitrogen in ammonia, NH3 Xenon in xenon tetrafluoride, XeF4 Iodine in the iodide difluoride ion, [IF2].otal coordination number = number of electron pairs = number of electrons in outer shell divided by 2. Methane, CH4, ammonia, NH3, the ammonium ion, [NH4]+ and the nitranion (amide ion), [NH2], [above] all have eight electrons in the valence shell of the central atom and all have a total coordination number of 4.