Pieces Of Gold

 Gold is a chemical element with the symbol Au and atomic number 79. It is a dense, soft, malleable and ductile metal with a bright yellow color and luster, the properties of which remain without tarnishing when exposed to air or water. Chemically, gold is a transition metal and a group 11 element. It is one of the least reactive chemical elements, and is solid under standard conditions. The metal therefore occurs often in free elemental form, as nuggets or grains, in rocks, in veins and in alluvial deposits. Less commonly, it occurs in minerals as gold compounds, such as with tellurium as calaverite, sylvanite, or krennerite.

As the metallic native element mineral, gold structurally belongs to the isometric copper group. It also forms a solid solution series with the native element silver to which it is often naturally alloyed. Other common natural gold alloys are with copper and palladium.

Gold resists attacks by individual acids, but it can be dissolved by aqua regia, so named because it dissolves gold. Gold also dissolves in alkaline solutions of cyanide, which have been used in mining.

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