This is the most common element detected using cold vapor atomic fluorescence spectroscopy. It’s not uranium, but Deinococcus radiodurans has been used to reduce an ion of this element for wastewater treatment. In warm organic-rich sediment, sulfate upregulates the biomethylation of this element. This element can act as either the anode or cathode during the electrolysis of sodium chloride in the (*) Castner–Kellner process. A dimethyl compound containing this element killed Karen Wetterhahn (10[2])when it permeated her latex gloves. (10[2])A common argument that vaccines (10[1])cause autism centers on an (-5[1])antifungal agent with this element, the preservative thimerosal. For 10 points, name this environmentally hazardous liquid metal (10[1])found in many thermometers. (10[1])■END■