Mercury

**Semantic type:** Element, Ion, or Isotope

**Definition:** A naturally occurring trace metalloid element and known neurotoxin with atomic symbol Hg, atomic number 80, and atomic weight 200.59. Mercury has been used in manufacturing, as well as in dental and medical equipment, fertilizers, and pesticides. It is characterized as a heavy, silvery-white metallic liquid at room temperature that is odorless. Exposure occurs by inhalation of fumes, ingestion, or contact.

**Synonyms:** - Hg - Hydrargyrum - Liquid Silver - MERCURY - MERCURY - Quicksilver - mercury