Euwebdesigns Link Directory
|Catalonia vote: Spain expected to impose direct rule|
|Mugabe named as goodwill ambassador by WHO|
|Storm Brian: UK braced for gale-force winds and disruption|
|Islamic State and the crisis in Iraq and Syria in maps|
|Ballet hoping to help heal Charleston's wounds|
|Tony Warren's script for Coronation Street forerunner found|
|Missing California hikers died in apparent murder-suicide|
|Brazil police arrests 108 in major anti-paedophilia operation|
|Brexit: Talk of deadlock is exaggerated, says Donald Tusk|
|Putin weighs in on Trump's performance as US president|
|Afghan suicide mosque attacks kill scores of worshippers|
|Anger over Donald Trump's UK crime tweet|
|Church of England to discuss same-sex blessing|
|The Papers: Road 'misery' to end and EU 'saves May'|
|What's it like to live in North Korea?|
|The woman without legs who became an equestrian champion|
|The NHS nurse using Botox to top up her salary|
|Week in pictures: 15-21 October 2017|
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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