Chemical symbol Ag. An element of atomic number 47, atomic weight 107.87, mp 960C, specific gravity 10.50. One of the noble metals that is not oxidised by heating in air. It is white in colour and very ductile and malleable. Silver was usually obtained by cupellation of lead ores, although it may also be extracted directly from silver sulphide deposits. Pure silver is often stated to be 1000 fine and alloys are based on this nomenclature. For example, sterling silver (qv) is 925 fine.