ARGON
Set to 18 different clues across 25 published puzzles, most often “Vacuum tube filler” — The New York Times, Sunday, 7 October 2007.
5 letters
Every clue on record, most used first
- Vacuum tube filler4 times
The New York Times — Sunday, 7 October 2007
- About 1% of the atmosphere4 times
The New York Times — Thursday, 20 May 2004
- Inert gas2 times
The New York Times — Monday, 6 October 2003
- Most common inert gas in the atmosphereonce
The New York Times — Tuesday, 1 March 2011
- Composition of some plasmasonce
The New York Times — Saturday, 26 June 2010
- Element whose name roughly means "lazy"once
The New York Times — Thursday, 3 January 2008
- Element whose name comes from Greek for "inactive"once
The New York Times — Sunday, 11 June 2006
- It's inertonce
The New York Times — Wednesday, 14 December 2005
- Laser gasonce
The New York Times — Monday, 21 February 2005
- About 1% of the Earth's atmosphereonce
The New York Times — Sunday, 11 January 2004
- Fluorescent lamp filleronce
The New York Times — Sunday, 20 October 2002
- Light bulb gasonce
The New York Times — Monday, 8 October 2001