The sum of all oxidation numbers in a molecule must add up to zero. Florine is normally a -1. Since their are 6 of them that's a total of -6. The only way for the molecule to add up to zero would be for Xenon to be a +6. read more
4. There is no compound of formula XeF. Xenon forms XeF2, XeF4 and XeF6. The O.N. of Xe is +2, +4 and +6 in XeF2, XeF4 and XeF6 respectively. read more