Silver: Difference between revisions
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*[http://periodic.lanl.gov/elements/47.html Los Alamos National Laboratory] | *[http://periodic.lanl.gov/elements/47.html Los Alamos National Laboratory] | ||
Revision as of 14:53, 18 November 2007
- This article refers to the silver metal. For other uses, see silver (disambiguation).
Silver is a metallic element. In normal temperature and pressure, silver is a hard, lustrous, malleable solid. It has been discovered and used by human beings since ancient times, and is often regarded as one of the precious metals, along with gold and platinum. Today, silver is often used in electrical devices (such as electrical contacts and wires) and jewelry. It was once used extensively to mint coins and as an antibacterial agent before the discovery of antibiotics (though today silver in colloidal form is still sold as a dietary supplement in the United States). Silver has a melting point of 960.8 Celsius and boiling point 2,212 Celsius. Common silver compounds include silver nitrate and silver iodide.
Properties
Silver has the highest electrical and thermal conductivity among all metals. Its chemical reactivity is quite low, but can tarnish in the presence of ozone, hydrogen sulfide, or air mixed with sulfur.