* Gold is a noble metal: This means it's very unreactive and resistant to chemical attack.
* Strong bonds: Gold atoms are held together by strong metallic bonds, making it difficult to break them apart.
* Aqua regia: The only known solvent for gold is a highly corrosive mixture of concentrated nitric acid and hydrochloric acid, known as aqua regia. Even this solution only works because of a complex chemical reaction, not simple dissolution.
Important Note: While gold is generally considered insoluble, trace amounts can dissolve in some highly specialized solutions, like cyanide solutions used in gold mining. However, these are not common solvents.
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