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Fakta om guld

Guld (latinskt namn Aurum) är ett grundämne som tillhör gruppen ädelmetaller och gruppen myntmetaller samt är ett mineral. Guld har det kemiska tecknet Au som kommer av aurum, det latinska ordet för guld. Det är en eftertraktad metall vilken under århundraden har använts som betalningsmedel, som värdebeständig tillgång, och som smycken. Metallen finns som korn och klumpar i berggrunden, i underjordiska ådror och i guldrik alluvialjord. Guld är kompakt, mjukt, glänsande och den mest formbara och tåliga av alla kända metaller. Rent guld har en klart gul färg som traditionellt har ansetts tilltalande.

Facts about gold

Gold is a chemical element with the symbol Au (from Latin: aurum "gold") and an atomic number of 79. Gold is a dense, soft, shiny, malleable and ductile metal. Pure gold has a bright yellow color and luster traditionally considered attractive, which it maintains without oxidizing in air or water. Chemically, gold is a transition metal and a group 11 element. It is one of the least reactive solid chemical elements. The metal therefore occurs often in free elemental (native) form, as nuggets or grains in rocks, in veins and in alluvial deposits. Less commonly, it occurs in minerals as gold compounds, usually with tellurium.

Gold resists attacks by individual acids, but it can be dissolved by the aqua regia (nitro-hydrochloric acid), so named because it dissolves gold. Gold also dissolves in alkaline solutions of cyanide, which have been used in mining. Gold dissolves in mercury, forming amalgam alloys. Gold is insoluble in nitric acid, which dissolves silver and base metals, a property that has long been used to confirm the presence of gold in items, giving rise to the term the acid test.

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