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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
Angela Veum
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