The structure of $XeOF_4$ is

In noble gases,the addition of successive electronic shells leads to a decrease in their ........ .

Given below are two statements:
Statement-$I$: Noble gases have very high boiling points.
Statement-$II$: Noble gases are monoatomic gases. They are held together by strong dispersion forces. Because of this,they are liquefied at very low temperatures. Hence,they have very high boiling points.
In the light of the above statements,choose the correct answer from the options given below:

Which of the following elements has zero valency?

The structure of the noble gas compound $XeF_4$ is

Xenon tetrafluoride,$XeF_4$ is: