Crossword clue: a soft silver-white univalent element of the alkali metal group; the lightest metal known; occurs in several minerals

The most common answer is lithium (7 letters).

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

Possible answers

lithium 7 letters wn-def

a soft silver-white univalent element of the alkali metal group; the lightest metal known; occurs in several minerals