- ARGON
- Light-bulb gas
- Colorless gas
- Common noble gas
- About 1% of the atmosphere
- Inert gas
- Gas used in insulation for some windows
- Noble gas
- Element #18
- Bulb gas
- Radio-tube element
- Gas in incandescent bulbs
- Gas in fluorescent bulbs
- It's hard to get a reaction out of this
- Incandescent lamp gas
- I would tell you a chemistry joke, but all the good ones _____
- Inert gas used in vacuum tubes
- Vacuum tube gas
- Fluorescent lamp filler
- Vacuum tube filler
- Gas in incandescent lamps
- It fills fluorescent and incandescent lamps
- Earth's most abundant noble gas
- Light gas
- Roughly 1% of the atmosphere
- Gas used in arc welding
- Fluorescent tube gas
- #18 on the periodic table
- A noble gas
- Inert gas used in welding
- About 1% of what you just inhaled
- Common inert gas
- You just inhaled some
- Third most common gas in Earth's atmosphere
- Element immediately below neon on the periodic table
- Element under neon on the periodic table
- Fluorescent lamp gas
- Volcanic gas
- About one percent of air
- Bulb filler
- Fluorescent bulb filler
- Almost 1% of the Earth's atmosphere
- Fluorescent bulb gas
- Incandescent bulb gas
- About 1% of the Earth's atmosphere
- First noble gas discovered
- Noble gas, and a homophonic hint to how this puzzle's four longest answers are formed
- One of the noble gases
- Gas in some lasers
- Noble gas that sounds like a French forest
- Noble gas in some lasers
- Alphabetically first noble gas
- Noble gas used in welding
- Noble gas that's roughly 1% of the atmosphere
- Radio-tube gas
- Odorless gas
- Light-bulb filler
- Tube gas
- Atomic number 18
- Gas in bulbs
- Rare gas
- Element in air
- Trace atmospheric element
- Most common inert gas
- Most common noble gas
- About 1% of air
- Inert gas in the atmosphere
- Inert gas in the air
- About 1% of the air
- #3 gas in the atmosphere
- National Archives' Declaration preservative
- Element in the oldest lava
- The most abundant noble gas on earth
- Gas used in light bulbs.
- Element in electric bulbs.
- Gas used in light bulbs, radio tubes, etc.
- Gaseous element.
- See 70 Across.
- Gaseous element in the air.
- Relative of 69 Across.
- Element.
- Inactive gas
- Gas used in light tubes
- Inert gaseous element
- Gaseous element in our atmosphere
- About 1 percent of the atmosphere
- Inert element
- Element in radio tubes
- A gaseous element
- Element found in 6 Across
- Element below neon on the periodic table
- First noble gas to be discovered
- Its atomic number is 18
- Scientific discovery of 1894
- Number 18
- Part of the atmosphere
- It's inert
- Laser gas
- Element whose name comes from Greek for "inactive"
- Element whose name roughly means "lazy"
- Composition of some plasmas
- Most common inert gas in the atmosphere
- .93% of the earth's atmosphere
- Gas in a vacuum tube
- It lights up when it's excited
- Roughly 1% of the earth's atmosphere
- This, on the periodic table
- Third-most abundant gas in the atmosphere
- Neighbor of krypton on the periodic table
- Element suggested phonetically by NOPQ STUV ...
- First noble gas, alphabetically
- Its atomic number is this clue's number divided by three
- Most abundant noble gas in the earth's atmosphere
- Neighbor of chlorine on the periodic table
- Element whose name anagrams to GROAN
- You're breathing a little right now
- Welding gas
- Inert gas in light bulbs
- Noble gas that glows violet in an electric field
- Odorless, colorless, inert gas
- Gas used in incandescent lamps
- An inert gas
- Inert elemental gas
- Wee bit of air
- Noble gas in air
- Noble gas in the atmosphere
- About 1% of Earth's atmosphere
- Noble gas that's an anagram of "organ"
- Noble gas used in lasers
- It's a gas
- Gas in incandescent lamps, perhaps
- About 1 percent of the Earth's atmosphere
- Common inert gas in the atmosphere
- Most abundant inert gas
- Element used in fluorescent tubes
- Gas used in insulating windows
- Gas in fluorescent lamps
- Gas in purple "neon" signs
- Most abundant noble gas in the atmosphere
- Element used in cryosurgery
- Third-most common gas in the atmosphere
- Most common of the noble gases
- Gas used in lasers
- Element named from the Greek for "lazy"
- Noble gas that's about 1% of the atmosphere
- About 1% of Earth's atmosphere, and a phonetic hint to this puzzle's gimmick
- About one percent of the atmosphere
- Most common noble gas in the atmosphere
- Third noble gas
