What is the structure for XeH4?

Answer 1

This is an exception to the octet rule, meaning you will have more than 8 electrons on the Xe in the center.

There are 12 electrons to be placed. 4 + 8 = 12. 4 comes from the hydrogens which each give one, and 8 from the Xe because it is in the 8A group.

They will be arranged so that all have a single bond to H and that leaves you with 4 electrons still to place to make 12. So they go on the Xe (two pairs).

H
H -Xe - H
H

Answer 2

XeH4 has a square planar molecular geometry with the xenon atom at the center and hydrogen atoms at the corners of the square. The xenon atom forms four single covalent bonds with each of the four hydrogen atoms.