gold

Posted by ROSHAN B.S on Aug. 24, 2014, 5:29 p.m.

Gold is a chemical element with the symbol Au and atomic number 79. It is a bright yellow dense, soft, malleable and ductile metal. The properties remain 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 (native) form, as nuggets or grains, in rocks, inveins and in alluvial deposits. Less commonly, it occurs in minerals as gold compounds, such as with tellurium as calaveritesylvanite, or krennerite.

As the metallic native element mineral, gold structurally belongs to the isometric coppergroup. It also forms a solid solution series with the native element silver (Ag) to which it is often naturally alloyed (electrum). Other common natural gold alloys are with copper andpalladium (Pd).

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