Euwebdesigns Link Directory
|House and home|
|Construction and Civil Engineering|
|Health and Food|
|Motor and Traffic|
|Education and IT|
|Labour vows to settle anti-Semitism complaints by July|
|Alfie Evans parents to appeal against Italy travel ban ruling|
|Man critical after Anfield attack before Liverpool-Roma clash|
|Kim Wall death - what we know so far|
|Euromillions: UK ticketholder scoops £121m jackpot|
|Trump and Macron hint at new Iran nuclear deal|
|Building material fire tests 'fail to properly assess risk'|
|Times distorted Muslim foster case, regulator finds|
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.