Enter a clue or pattern or both:

The Clue

Radioactive elements (9 letter answer)

The Answer

ACTINIDES

Tags


Notes

The answer ACTINIDES is so rare that it appears less than once every 2500 puzzles.

Definition

ACTINIDE as a noun:

1. (actinoid, actinide, actinon) = any of a series of radioactive elements with atomic numbers 89 through 103