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|No final Grenfell Tower death toll this year, police say|
|Six face charges over Hillsborough disaster|
|Public sector pay cap under review, No 10 suggests|
|London bridge attack officer: 'I wasn't backing down'|
|Migrant crisis: Italy threatens to shut ports|
|Milly Dowler's sister: I lost my childhood|
|Boy, 5, saves brother from choking on meatball|
|UK film industry 'needs more diversity'|
|Brexit 'will blow hole in budget', EU commissioner warns|
|Paddington Bear creator Michael Bond dies|
|Female Kurdish sniper cheats death at hands of IS|
|Newly erected Arkansas Ten Commandments monument destroyed|
|Sheikh steps in to buy village chapel in Cornwall|
|The strange things people put in luggage|
|Barack Obama and family enjoy Indonesia holiday|
|Ironing robot tackles creased clothes|
|Paddington: Sharing childhood bears for Michael Bond|
|In pictures: The V&A's new wing|
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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