Metals, Heavy

**Definition:** Metals with high specific gravity, typically larger than 5. They have complex spectra, form colored salts and double salts, have a low electrode potential, are mainly amphoteric, yield weak bases and weak acids, and are oxidizing or reducing agents (From Grant & Hackh's Chemical Dictionary, 5th ed)

**Tree numbers:** - D01.268.556 - D01.552.544

**Synonyms:** - Heavy Metals - Heavy Metal