Gold

Compounds/isotopes

Although gold is a noble metal, it can form many compounds, auric chloride (AuCl3) and chlorauric acid (HAuCl4) being the most common. Gold compounds can be aurous (univalent, +1) or auric (trivalent, +3). Gold also can under extreme conditions form a +5 state with fluorine (gold pentafluoride, AuF5), as well as (unusually for a metal), a -1 state. Such compounds containing the Au- anion are called aurides and include caesium auride, CsAu, rubidium auride, RbAu, and tetramethylammonium auride, (CH3)4N+ Au-.

Related Topics:
Noble metal - Cl - H - Anion - Caesium - Rb

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Gold also forms:

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• The AuCl₄^- ion after dissolving in aqua regia
• Gold halides (F,Cl,Br,I)
• Gold chalcogenides (O, S, Se,Te)
• Gold cluster compounds
• Aurous hydrazide: an explosive olive-green powder, AuN₂H₄, known archaically as aurum fulminans

There is only one stable isotope of gold, and 18 radioisotopes with Au-195 being the most stable with a half-life of 186 days.

Related Topics:
Isotope - Radioisotope - Half-life

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