Name an element of group 18 which can form compounds.

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Hint: As we know, elements of group 18 contain eight valence electrons which makes them stable, and also they are not so powerful oxidizing agents and they are not able to accept or donate their electrons to others.

Complete answer:
Xenon from Group 18 can form compounds with highly electronegative elements like Fluorine and Oxygen.
For example:- $Xe{F_4}$ , $Xe{O_3}$ ,etc.
Krypton also forms compounds with highly electronegative elements like Fluorine. There are two known compounds of Krypton with Fluorine.
-Krypton difluoride ($KrF_2$)
-Krypton fluoride ($KrF$)
Krypton fluoride is used in high-resolution Photolithography machines, it is used to manufacture microelectronic chips in nanometer dimension.
We all know that group 18 is of noble gases and the noble gases cannot form compounds except a few of them because all noble gases (save helium, which has no p sublevel) have entire s and p outer electron shells, they are difficult to combine chemically. They were not predicted to be reactive due to their high ionisation energy and near-zero electron affinity. And also because they have eight valence electrons which makes them stable.
Or, in other words, we can say that: the electrical configuration of noble gases is steady. They don't have an inclination to gain or lose electrons. Electronics are gained or lost in a chemical process (also sharing which I assume here as gaining).
Despite the fact that noble gases generally do not form connections with other atoms, the xenon's final electrons (valence electrons) are distant enough from the nucleus to be attracted by atoms that are exceedingly electronegative (eg, fluorine and oxygen). The first xenon compound was found in 1962, and there have been roughly eighty since then. The majority are fluorine and/or oxygen-containing compounds, although there are other compounds including carbon and other less electronegative atoms bound to xenon.
Xenon and Krypton both can form compounds with highly electronegative elements.

There is also the possibility in which the formation of compounds doesn’t occur. While there is such a thing as metallic bonding, when two or more metals are combined, the outcome is a mixture. This indicates that, unlike a compound, there is no definite proportion to the combination. This is impossible to achieve using a compound.