All noble gases crystallize in $ccp$ structure. Which one is an exception?

From which of the following are noble gases $NOT$ obtained?

Noble gases do not react with other elements because...

Xenon forms different types of compounds. One of the compounds is represented as $XeO_{n_1}F_{n_2}$. If the ratio of $n_1$ to $n_2$ is $1$ for this compound,then which of the following options is incorrect?

Which element out of $He$,$Ar$,$Kr$,and $Xe$ forms the least number of compounds?

The elements with atomic numbers $10$,$18$,$36$,$54$,and $86$ are all