Answer:

XENON

Answer	Crossword Clue
XENON	Arc-lamp gas
XENON	Radio-tube gas
XENON	Inert gas

XENON	One of the noble gases
XENON	Stroboscopic-lamp gas
XENON	Element number 54
XENON	Rare gas
XENON	Noble gas
XENON	Gas used in lasers
XENON	Colorless gas
XENON	Rare but useful gas

XENON	Radio tube gas
XENON	A noble gas
XENON	Gas used in high-intensity headlights
XENON	It's under krypton on the periodic table
XENON	Gas used in arc lamps
XENON	It's a gas
XENON	Arc lamp gas
XENON	Flash lamp gas

XENON	It follows iodine in the periodic table
XENON	It might be in the spotlight
XENON	Gas used in strobe lights
XENON	Air component
XENON	An inert gas
XENON	Element named after the Greek word for "strange"
XENON	Gas in television tubes
XENON	Hard-to-combine gas

XENON	Gas in strobe lights
XENON	Radio tube filler
XENON	Television tube filler
XENON	Inert gas used in lights
XENON	"54" on the periodic table
XENON	Atomic number 54
XENON	Colorless, inactive gas
XENON	Headlight gas

XENON	Light gas
XENON	Gas present in the Martian atmosphere
XENON	Gas used in headlights
XENON	Gas used in plasma screens
XENON	Unreactive gas