Silver: Difference between revisions
imported>Milton Beychok (Various minor edits and re-formatting.) |
imported>Mark Widmer (Opening paragraph revised to match standard: Phase, symbol, atomic no., and std. atomic weight. Combined standard opening with existing description of metallic properties. Added density, under "Properties") |
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|hazard=Most silver salts are poisonous. Silver compounds can be absorbed in the circulatory system and cause [[argyria]]. | |hazard=Most silver salts are poisonous. Silver compounds can be absorbed in the circulatory system and cause [[argyria]]. | ||
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'''Silver''' is a [[Chemical elements|chemical element]], typically found as a [[Solid_(state_of_matter)|solid]] in its elemental form. It has the [[chemical symbol]] Ag (from the Latin ''argentum''), [[atomic number]] (number of [[protons]]) ''Z'' = 47, and a [[Atomic mass#Standard atomic weights of the elements|standard atomic weight]] of 107.8682 g/mol. At normal [[atmospheric pressure]] and typical room temperatures, silver is a hard, lustrous, malleable and ductile solid. It is considered to be a member of the "Transition metal" class of elements. | |||
'''Silver''' is a [[Chemical elements|chemical element]], | |||
Silver has been known and used by mankind since ancient times, and is commonly regarded as one of the [[precious metal]]s, along with [[gold]] and [[platinum]]. Today, silver is often used in electrical devices (such as electrical contacts and wires) and [[jewelry]].<ref name=LANL>[http://periodic.lanl.gov/47.shtml Los Alamos National Laboratory (LANL)]</ref> It was once used extensively to mint coins and as an antibacterial agent before the discovery of [[antibiotics]] (though today silver in [[colloid]]al form is still sold as a dietary supplement in the [[United States]]). | Silver has been known and used by mankind since ancient times, and is commonly regarded as one of the [[precious metal]]s, along with [[gold]] and [[platinum]]. Today, silver is often used in electrical devices (such as electrical contacts and wires) and [[jewelry]].<ref name=LANL>[http://periodic.lanl.gov/47.shtml Los Alamos National Laboratory (LANL)]</ref> It was once used extensively to mint coins and as an antibacterial agent before the discovery of [[antibiotics]] (though today silver in [[colloid]]al form is still sold as a dietary supplement in the [[United States]]). | ||
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==Properties== | ==Properties== | ||
At a [[pressure]] of 101.325 k[[Pascal (unit)|Pa]], it has a [[boiling point]] of 2,162 °[[Celsius (unit)|C]] and a [[melting point]] of 961.78 °C.<ref name=LANL/> It's density is 10.5 g/cc. | |||
At a [[pressure]] of 101.325 k[[Pascal (unit)|Pa]], it has a [[boiling point]] of 2,162 °[[Celsius (unit)|C]] and a [[melting point]] of 961.78 °C.<ref name=LANL/> | |||
Silver has the highest electrical and thermal [[conductivity]] among all metals. Its chemical reactivity is | 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]].<ref name=LANL/> | ||
==References== | ==References== | ||
{{reflist}} | {{reflist}} | ||
Revision as of 08:55, 31 January 2021
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Silver is a chemical element, typically found as a solid in its elemental form. It has the chemical symbol Ag (from the Latin argentum), atomic number (number of protons) Z = 47, and a standard atomic weight of 107.8682 g/mol. At normal atmospheric pressure and typical room temperatures, silver is a hard, lustrous, malleable and ductile solid. It is considered to be a member of the "Transition metal" class of elements.
Silver has been known and used by mankind since ancient times, and is commonly 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.[1] 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).
Properties
At a pressure of 101.325 kPa, it has a boiling point of 2,162 °C and a melting point of 961.78 °C.[1] It's density is 10.5 g/cc.
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.[1]