Who among the following discovered $Argon$?

$Xe_{(g)}$ 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:

Identify the gases used to fill in electric bulbs.

Complete hydrolysis of $XeF_6$ gives $HF$ along with compound $X$. The hybridisation in $X$ is

The type of hybridisation and number of lone pair$(s)$ of electrons of $Xe$ in $XeOF_4$ respectively are

Who discovered the first noble gas?