ISOTOPE
Set to 8 different clues across 10 published puzzles, most often “Elemental form” — The New York Times, Thursday, 24 April 2008.
7 letters
Every clue on record, most used first
- Elemental form2 times
The New York Times — Thursday, 24 April 2008
- Heavy hydrogen, e.g.2 times
The New York Times — Monday, 26 December 2005
- Member of a fictional Springfield baseball teamonce
The New York Times — Tuesday, 3 May 2011
- Chemical relativeonce
The New York Times — Wednesday, 17 March 2004
- Chemist's studyonce
The New York Times — Thursday, 28 August 2003
- Carbon-14, e.g.once
The New York Times — Sunday, 9 June 2002
- Element formonce
The New York Times — Sunday, 28 March 1999
- U-235 or C-14, e.g.once
The New York Times — Tuesday, 16 February 1999