   Chapter 21, Problem 86PS

Chapter
Section
Textbook Problem

Draw the Lewis electron dot structure for XeO3F2. What is its electron-pair geometry and its molecular geometry?

Interpretation Introduction

Interpretation: To draw the lewis dot structure of XeO3F2 molecule and its molecular geometry and electron pair geometry is to be stated.

Concept introduction: The ground state outer electronic configuration of Xenon atom is 5s25p6, that is the total number of valence shell of electrons in xenon atom is eight.

Electron geometry is the shape of a molecule predicted by considering both bond electron pairs and lone pair of electrons.

Molecular geometry is the shape of a molecule predicted by considering only bond pair of electrons

According to VSEPR theory, the geometry is predicted by the minimizing the repulsions between electron-pairs in the bonds and lone-pairs of electrons. The VSEPR theory is summarized in the given table as,

Electron-pairlone-pairElectron-pairgeometryMolecularshape20LinearLinear30TrigonalplanarTrigonalplanar21TrigonalplanarBent40TetrahedralTetrahedral31TetrahedralPyramidal22TetrahedralVshape50TrigonalbipyramidalTrigonalbipyramidal41TrigonalbipyramidalSeesaw32TrigonalbipyramidalTshape23TrigonalbipyramidalLinear60OctahedralOctahedral51OctahedralSquarepyramidal42OctahedralSquareplanar

Explanation

A lewis dot structure is a diagram that show bonding between the atoms. A lewis dot structure is used to predict the geometry of the molecule.

Depending on the number of XeF bond and Xe=O bond to be formed in XeO3F2 molecule, the requisite number of electrons of the 5p and 5s orbital of the valence shell of Xe get unpaired and promoted to vaccant d-orbital of the same sub-shell. The excitation of three p-electrons and one of s-electron into vaccant d-orbital of same sub-shell, thus making eight unpaired electrons available for bond formation

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