Elements with outer electronic configuration $ns^2np^6$ are

The reason for the lowest boiling point of $He$ is...

Which of the following noble gases does not form clathrate compounds?

$Xe_{(g)}$ and $F_{2(g)}$ react in the ratio $1:20$ at $573 \ K$ and $60-70 \ bar$ to form $A$. When $A$ is completely hydrolyzed,$B$ and $HF$ are formed. $A$ and $B$ are respectively:

The melting and boiling points of noble gases are ...

Xenon hexafluoride on partial hydrolysis produces compounds $X$ and $Y$. Compounds $X$ and $Y$ and the oxidation state of $Xe$ are respectively