Which noble gas is most abundant in the atmosphere?

Find the product of the following reaction,when $Xe$ is taken in excess:
$Xe_{(g)} + F_{2(g)} \longrightarrow ?$

$A$ xenon compound '$A$' upon partial hydrolysis gives $XeO_{2}F_{2}$. The number of lone pairs of electrons present in compound $A$ is ....... . (Round off to the nearest integer)

Why do noble gases have comparatively large atomic sizes?

Assertion $(A)$: The boiling points of noble gases increase from $He$ to $Xe$.
Reason $(R)$: The interatomic van der Waals' attractive forces increase from $He$ to $Xe$.
The correct answer is:

$XeF_4$ on partial hydrolysis produces