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## Homework Statement

What is the geometry of AsH

_{3}according to the VSEPR model?

## The Attempt at a Solution

As has 5 valence electrons and H has one. The molecule therefore has four sets of electron pairs, whereof one is unshared. This gives a tetrahedral structure where the As-H angles are 107 degrees.

However, according to the solutions manual the geometry is triangular planar. Why?

I also have a problem with the geometry of OF

_{2}. Here, there are four sets of electron pairs, whereof two are unshared. I would expect the geometry of this molecule to be bent, but it's linear according to my book.

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