BORON

Set to 9 different clues across 10 published puzzles, most often “Element #5” — The New York Times, Sunday, 31 October 2004.

5 letters

Every clue on record, most used first

Element #52 times
The New York Times — Sunday, 31 October 2004
Group 13 member, in chemistryonce
The New York Times — Saturday, 30 October 2010
Ulexite is rich in itonce
The New York Times — Saturday, 13 March 2010
The fifth elementonce
The New York Times — Sunday, 5 October 2008
A metalloidonce
The New York Times — Friday, 17 November 2006
Element with the symbol Bonce
The New York Times — Monday, 18 October 2004
Element in colemaniteonce
The New York Times — Saturday, 7 June 1997
Kernite componentonce
The New York Times — Saturday, 24 February 1996
Fifth elementonce
The New York Times — Friday, 4 August 1995