Who discovered the first noble gas?

Which of the following does not exist?

Assertion $(A)$: Noble gases have very low boiling points.
Reason $(R)$: All noble gases have general electronic configuration of $ns^2 np^6$ (except $He$).

Which of the following products are obtained by the reaction of $XeF_6$ with $SiO_2$?

Which of the following noble gases is not present in the atmosphere?

As we move down the group in noble gases,which of the following values decreases due to the addition of successive electronic shells?