RADIUM

Chemical element, Ra (6)

Solution has appeared in 3 crosswords (1 across and 2 down):

• Quick crossword No 16,622 — 2023-08-14 23:00:28
  19D: Intensely radioactive element found in uranium ores, Ra (6)
• Quick crossword No 16,479 — 2023-03-01 00:00:17
  4D: Element discovered by Marie and Pierre Curie (6)
• Quick crossword No 15,668 — 2020-07-24 23:00:38
  16A: Chemical element, Ra (6)