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

State the uses of noble gases.

$XeF_6$ is

$XeF_{6}$ on partial hydrolysis gives a compound $X$,which has square pyramidal geometry. '$X$' is

Assertion $(A)$: Helium has the lowest boiling point $(4.2 \ K)$.
Reason $(R)$: The forces that exist between helium atoms are weak dispersion forces.

Gradual addition of electronic shells in the noble gases causes a decrease in their