CHEM 210 Chapter Notes - Chapter 5: Lone Pair, Vsepr Theory, Molecular Geometry

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25 Oct 2017
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Molecular Bonds and Molecular Geometry
● VSEPR
○ Valence Shell Electron Pair Repulsion
○ Electrons in bonds and in lone pairs can be thought of as occupying
“charge clouds,” or regions of electron density, that repel one another and
stay as far apart as possible, thus causing molecules to assume specific
shapes.
○ Working from an electron-dot structure, count the number of “charge
clouds” and then determine the molecular shape
● Molecular Shape
○ Electron groups around the central atom will be most stable when they are
as far apart as possible
○ The balloon analogy demonstrates position of electron domains around a
central atom with respect to each other
ABx
A is the central atom surrounded by x B atoms
X can have integer values of 2 to 6
● Charge Clouds
○ Each lone pair of electrons
○ Single electron
○ Single, double or triple bonds are counted as only one charge cloud
Refer to chart below for further understanding of molecular geometry
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