Lightweight Silver Metal, or a David Guetta Song
Puzzle 18 of Periodic Table Medium Pack
Question is: Lightweight Silver Metal, or a David Guetta Song
and the answer is: TITANIUM
Word Meaning:
TITANIUM — A chemical element, atomic number 22; it is a strong, corrosion-resistant transition metal, used to make light alloys for aircraft etc.
Definitions from Wiktionary.