Gold Wallpapers QHD

40 best QHD Gold Wallpapers

QHD Gold Wallpapers. Features:

- 40 best Gold wallpapers for tablets and smartphones.

- Only QHD quality wallpapers.

- Two ratio modes for Gold wallpapers.

- Saving or installing wallpapers without internet connection.

Gold facts:

Gold is a chemical element with symbol Au (aurum) and atomic number 79. Chemically, gold is a transition metal and a group 11 element. Golds high malleability, ductility, resistance to corrosion and most other chemical reactions, and conductivity of electricity have led to its continued use in corrosion resistant electrical connectors in all types of computerized devices (its chief industrial use). Gold is also used in infrared shielding, colored-glass production, and gold leafing. Certain gold salts are still used as anti-inflammatories in medicine.

Gold is unaffected by oxygen at any temperature; similarly, it does not react with ozone. Gold is strongly attacked by fluorine at dull-red heat to form gold(III) fluoride.

Powdered gold reacts with chlorine at 180 to form AuCl3. Gold reacts with bromine at 140 to form gold(III) bromide, but reacts only very slowly with iodine to form the monoiodide.

Gold does not react with sulfur directly, but gold(III) sulfide can be made by passing hydrogen sulfide through a dilute solution of gold(III) chloride or chlorauric acid.

Gold readily dissolves in mercury at room temperature to form an amalgam, and forms alloys with many other metals at higher temperatures. These alloys can be produced to modify the hardness and other metallurgical properties, to control melting point or to create exotic colors.

Gold reacts with potassium, rubidium, caesium, or tetramethylammonium, to form the respective auride salts, containing the Au ion. Caesium auride is perhaps the most famous.

Gold is unaffected by most acids. It does not react with hydrofluoric, hydrochloric, hydrobromic, hydriodic, sulfuric, or nitric acid. It does react with selenic acid when hot and concentrated, as well as mixture of nitric and hydrochloric acids known as aqua regia.

Gold is similarly unaffected by most bases. It does not react with aqueous, solid, or molten sodium or potassium hydroxide. It does however, react with sodium or potassium cyanide under alkaline conditions when oxygen is present to form soluble complexes.

Common oxidation states of gold include 1 (gold(I) or aurous compounds) and 3 (gold(III) or auric compounds). Gold ions in solution are readily reduced and precipitated as metal by adding any other metal as the reducing agent. The added metal is oxidized and dissolves, allowing the gold to be displaced from solution and be recovered as a solid precipitate.

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