Enter a clue or pattern or both:
The Clue
Discovery of 1898 (6 letter answer)
The Answer
RADIUM
Tags
Notes
The answer RADIUM is so rare that it appears less than once every 2500 puzzles.
Related Clues
Curie's discovery
Curies' find
Alpha particle emitter
Definition
RADIUM as a noun:
1. (radium, Ra, atomic number 88) = an intensely radioactive metallic element that occurs in minute amounts in uranium ores