Please Help me on molecular geometry..........???

Question

When the total no. of electron pairs surrounding a central atom in a molecule is 7 and there is no lone pair, then all the electron pairs are bond pairs. The molecule has pentagonal bipyramidal geometry.
But when there are 6 bond pairs and 1 lone pair electron surrounding the central atom, "where should be the location of the lone pair electron-----in one of the equatorial positions or in one of the axial positions..????"

Further what is the name of such type of geometry????

or rather what is the geometry of XeF6..????

Answer 1

There are two geometries for a molecule with 6 bond pairs and 1 lone pair on the central atom. The 6 bonds could be in an octahedral arrangement or trigonal prism formation. The trigonal prism orientation is like octahedral with one of the faces twisted by 60o, similiar to eclipsed and staggered conformations in organic chemistry. With the additional lone pair of electrons, the geometries would be called distorted octahedral and distorted trigonal prism.

Without obtaining an X-ray crystal structure of XeF6 it would be hard to know the geometry, but I would say that the distorted octahdral geometry would be the most stable.

Answer 2

nicely, the electrons are not actually sitting there next to a minimum of one yet another. they are in consistent action. the belief of paired electrons is for bonding. There can, besides the fact that, be a single electron. Take nitrogen, for occasion. It has 5 valence electrons, so 2 factors could have pairs, and one facet could have an electron via itself. enable's say we mandatory to bond this with Fluorine. F has 7 valence electrons, so it additionally has a lone electron on one facet, so this can be the positioning that the lone nitrogen electron could bond, becoming a bond with 2 electrons. returned, bear in mind that electrons are continually shifting at almost the fee of sunshine. they are in no way basically sitting next to a minimum of one yet another, it quite is largely a thank you to certainly visualize how bonding works. wish this helped, i'm nevertheless analyzing Chemistry.

Answer 3

I suppose that the best description is "distorted octahedral", because that is what it will look like, with the extra repulsive effect of the lone pair.