What is the elemental symbol for mercury?

Hg is the elemental symbol for mercury because it comes from the Latinized Greek name hydrargyrum, meaning “water-silver” (hydor + argyros), a nod to its silvery, liquid form. By contrast, Mc is moscovium (a different element), and Me and Hy aren’t valid elemental symbols. Mercury (atomic number 80) is the only metal that’s liquid at room temperature. It was widely used in thermometers, barometers, and dental amalgams, but its toxicity has led to safer alternatives. Memory tip: Hg = Hydrargyrum—think “Hydro” (water) + “Argyr-” (silver). Or picture quicksilver glinting like liquid silver and tag it with the letters H and g.