The Ammonium reference article from the English Wikipedia on 24-Apr-2004
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Ammonium

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Ammonium (NH4+) is a group of atoms that behave like an alkali metal. It is found ionized in various salts, such as ammonium bicarbonate and ammonium chloride.

Ammonium has been isolated in amalgam, but not as a solid metal.

Ammonium is also found in urine.

See also