Which element does not react with $F_2$?

The structure of $XeOF_4$ is

Which of the following statements is $NOT$ true for noble gases?

$XeO_4$ molecule is tetrahedral having

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

$Xe_{(g)} + 2 F_{2(g)} \xrightarrow[7 \text{ bar }]{873 \text{ K}} XeF_{4(s)}$
The ratio of $Xe : F_2$ required in the above reaction is