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Question 6.CC.7: Predict the shape of AsCl3....

Predict the shape of AsCl_3.

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From its Lewis structure, we see that AsCl_3 has four electron groups with three bonded atoms.

\begin{array}{c}\underset{\cdot\cdot}{\overset{\cdot\cdot}{\text{:Cl:}}}\underset{\cdot\cdot}{\overset{\cdot\cdot}{\text{As:}}}\underset{\cdot\cdot}{\overset{\cdot\cdot}{\text{Cl:}}}\\\underset{\cdot\cdot}{\text{:Cl:}}\end{array}

The electron-group geometry is tetrahedral, but with the central atom bonded to three Cl atoms, the shape is trigonal pyramidal.

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