Hybridization is defined as the concept of mixing two atomic orbitals with the same energy levels to give a degenerated new type of orbitals. Based on the types of orbitals involved in mixing, the hybridization can be classified as sp3, sp2, sp, sp3d, sp3d2, sp3d3.
Hybridisation of Xe in XeO3
The central atom = Xe
No monovalent group attached to the central atom since O is a bivalent group.
Number of valency electrons = 8
Charge = 0
n = (V + M ± C )/2
V = number of valence shell electrons in central atom
M = number of monovalent atoms bonded to a central atom
C = charge of the radical
n = 8/2
n = 4
So the hybridisation of Xe in XeO3 is sp3 . XeO2 is the trigonal pyramidal.