$(a)$ In this crossword puzzle (Fig),names of $11$ elements are hidden. Symbols of these are given below. Complete the puzzle.
$1. Cl$
$2. H$
$3. Ar$
$4. O$
$5. Xe$
$6. N$
$7. He$
$8. F$
$9. Kr$
$10. Rn$
$11. Ne$
$(b)$ Identify the total number of inert gases,their names,and symbols from this crossword puzzle.

(A) The completed crossword puzzle reveals the names of the $11$ elements: Chlorine $(Cl)$,Hydrogen $(H)$,Argon $(Ar)$,Oxygen $(O)$,Xenon $(Xe)$,Nitrogen $(N)$,Helium $(He)$,Fluorine $(F)$,Krypton $(Kr)$,Radon $(Rn)$,and Neon $(Ne)$.
$(b)$ Inert gases (Noble gases) are elements that have a stable electron configuration. From the given crossword,there are $6$ inert gases present: Helium $(He)$,Neon $(Ne)$,Argon $(Ar)$,Krypton $(Kr)$,Xenon $(Xe)$,and Radon $(Rn)$.