The discovery of oxygen by Carl Scheele [SHAY-luh] and Joseph Priestley was accomplished by heating the oxide of this element. This compound was used with salt and copper sulfate to extract silver in the patio process. This is combined with silver, tin, and copper to make dental fillings known as amalgams, though its use is controversial because of its high toxicity. Similar concerns have decreased its use in vaccines and thermometers. Name this 
The discovery of oxygen by Carl Scheele [SHAY-luh] and Joseph Priestley was accomplished by heating the oxide of this element. This compound was used with salt and copper sulfate to extract silver in the patio process. This is combined with silver, tin, and copper to make dental fillings known as amalgams, though its use is controversial because of its high toxicity. Similar concerns have decreased its use in vaccines and thermometers. Name this element formerly known as quicksilver, a metal that is liquid at room temperature.
The discovery of oxygen by Carl Scheele [SHAY-luh] and Joseph Priestley was accomplished by heating the oxide of this element.
mercury (prompt on "Hg")