Gold

**Formula:** Au

**Atomic number:** 79

**International title:** aurum

**Relative atomic mass:** 196,966 g/mol

**Mohs scale hardness:** 2,5‒3

**Crystal system:** cubic system

**Cell:** Face centred cubic

**Crystal habit:** It often occurs as a free elemental form as nuggets or grains in rocks, veins and alluvial deposits.

**Information:** Gold is chemically resistant with a very good thermal and electrical conductivity, relatively soft and is a yellow precious metal. Gold is a chemically stable element and does not dissolve in conventional acids or bases except in aqua regia.

**Use:** Gold is most commonly used in jewellery, electrical contacts, dentistry and gilding objects from less noble metals.

**Appearance:** It occurs mainly pure.



## Keywords
gold, crystal, metals, mettalurgy