Enter a clue or pattern or both:
The Clue
Element #39 (7 letter answer)
The Answer
YTTRIUM
Tags
Notes
The answer YTTRIUM is so rare that it appears less than once every 2500 puzzles.
Definition
YTTRIUM as a noun:
1. (yttrium, Y, atomic number 39) = a silvery metallic element that is common in rare-earth minerals; used in magnesium and aluminum alloys