Question

In: Chemistry

Draw the VSEPR structure for XeO2F2. Give the name of the molecular shape and indicate the...

Draw the VSEPR structure for XeO2F2. Give the name of the molecular shape and indicate the bond angles.

Solutions

Expert Solution

The central atom in XeO2F2 is Xe.It belongs to VIII A group in the periodic table and has 8 valence e⁻ .Around this Xe atoms there are two Oxygen( divalent atom) atoms & two Fluorine(mono valent atom) atoms.

So Xe forms two single bonds with F atom & two double bonds with each O atom.

So there are 6 bond pairs & 1 lone pair on Xe atoms.It is an AX4E system based on trigonal bipyramid but with an equatorial site occupied by a lp. It has a see-saw structure.

F atoms always go axial in trigonal bipyramidal structures and the Xe=O will occupy more space so it will favor the equatorial sites & it will also occupy space than a typical bond pair.We have lp-bp>bp-bp for repulsion. So we would predict F-Xe-F < 180° and O-Xe-O to be < 120° .

The configuration of XeO2F2 is that of a trigonal bipyramid with axial F and equatorial O atoms and 1 vacant equatorial position. The O-Xe-O, O-Xe-F, and F-Xe-F bond angles are 105.7°, 91.6°, and 174.7°, respectively.


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