Elements [Chemical/Ingredient] Metals, Light [Chemical/Ingredient] Metals with low specific gravity, typically smaller than 5, characterized by a single valence (1, 2, or 3), a simple spectrum, strong electromotive force (positive), and colorless compounds. (From Grant & Hackh's Chemical Dictionary, 5th ed) C0376709 Light Metals D019565 114297 Metals, Light N0000008004 Metals, Light C26372 M0029055 Metals [Chemical/Ingredient]