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AmalgamAn amalgam is an alloy of mercury. Most metals are soluble in mercury, but some (such as iron) are not. Amalgams are commonly used in dental fillings. Ammonium has been isolated in amalgam, but not as the pure pseudometal - it decomposes to ammonia and hydrogen. 
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Amalgam".