Answer: hafnium

AnswerCrossword Clue
HAFNIUMElement name derived from the Latin for "Copenhagen"
HAFNIUMElement .72
HAFNIUMChemical element.
hafniumgray, toxic metallic element with a high melting point (over 2000┬░C), found in most zirconium minerals. Symbol: Hf; at. wt.: 178.49; at. no.: 72; sp. gr.: 12.1