Euwebdesigns Link Directory
|Belgrave Middleway crash: Six dead in six-vehicle smash|
|Brexit: Theresa May says she 'will not be derailed'|
|Pensions: Automatic saving to start at 18 under new plans|
|Self-exclusion scheme in betting shops flawed|
|Strictly Come Dancing 2017 final: Winner crowned|
|Pentagon ran secret multi-million dollar UFO programme|
|Trump Russia inquiry: Mueller improperly obtained emails, lawyer says|
|Ashes: England face defeat as Australia inch closer to winning back urn|
|Defence budget: New equipment at risk over MoD savings 'doubts'|
|Sydney man charged with being 'economic agent' for North Korea|
|South Africa's ANC party to vote for new leader|
|Chile: Landslide destroys village and kills at least five|
|Bradley Lowery: Award for Sunderland mascot at BBC Sports Personality|
|Newspaper headlines: Brexit warnings for Theresa May|
|Taking two million photos of Obama|
|Poverty and loneliness impact millions at Christmas|
|The caravan of mothers looking for their lost children|
|Grenfell Tower: School in the shadow of disaster|
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.
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