Silver (chemical element)

Physical and chemical characteristics

Silver is soft, highly ductile and malleable, with excellent electrical and thermal conductivity — the highest of all metals at room temperature. It resists corrosion in pure air but tarnishes readily when exposed to sulfur-containing compounds, forming a dark silver sulfide layer. Chemically, silver most commonly occurs in the +1 oxidation state (Ag+); it also forms a variety of compounds such as silver nitrate and light-sensitive silver halides.

Occurrence and extraction

Silver is found both as native metal and combined in ores. Economically important minerals include silver sulfides and silver-bearing lead and copper ores. Many commercial deposits are mined for multiple metals; silver is recovered by smelting and refining techniques such as electrorefining and chemical extraction. Recycling of silver from industrial waste and old jewelry is a significant source of supply. For technical and mineralogical details see a mineral reference or a transition metal overview.

History and cultural significance

Humans have used silver since antiquity for ornaments, coinage and tableware. Its reflective properties made it useful for mirrors long before modern coating methods. Silver has carried economic and symbolic weight in many cultures and remains important in bullion markets and collectibles.

Uses and applications

• Jewelry, silverware and coinage for aesthetic and monetary roles.
• Electrical contacts, conductors and printed electronics for its conductivity.
• Optics and mirrors due to high reflectivity.
• Photographic film and papers historically relied on silver halides; digital photography has reduced but not eliminated industrial demand.
• Catalysts, antimicrobial coatings and medical devices where silver ions or nanoparticles are used for their biological activity.

Safety and environmental notes

Metallic silver is of low chemical reactivity and poses limited acute toxicity, but certain silver compounds and prolonged exposure can cause argyria, a permanent grayish skin discoloration. The environmental and health effects of engineered silver nanoparticles are under study, and releases to water and soil are subject to regulation and recycling efforts.

Silver remains a multifaceted material: valued historically as a precious metal and today critical to many industrial, medical and technological applications.

Etymology • Element data • Chemistry overview • Mineralogy