Alkaline Earth Metal for X-Ray Radiocontrasting
Puzzle 1 of Periodic Table Medium Pack
Question is: Alkaline Earth Metal for X-Ray Radiocontrasting
and the answer is: BARIUM
Word Meaning:
BARIUM — The chemical element (symbol Ba) with an atomic number of 56. It is a soft, reactive, silvery alkaline earth metal.
Definitions from Wiktionary.