The structure of Xenon trioxide is shown below: With reference to the valence shell electron pair repulsion theory (VSEPR), the shape of XeO3 is:

Explanation

To determine the shape of the molecule, you must find the number of bonding pairs of electrons and lone pairs of electrons. Pi bonds are to be excluded. The molecule has three single bonds which correspond to three bonding pairs of electrons, and one lone pair of electrons, resulting in a structure similar to that of ammonia, which is trigonal pyramidal so, the answer is D. Option A would occur in a molecule with only three bonding pairs of electrons. Option B would occur in a molecule with four bonding pairs of electrons. Option C would occur in a molecule with either two bonding pairs with one lone pair or with two bonding pairs and two lone pairs of electrons.