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The ion NH4 behaves like a mono valent alkali metal.

Ammonium (hydrox. of)
A solution of ammonia in water:
Chemical name: Ammonium hydroxide
Chemical formula: NH4OH

Ammonium chloride
Trade name: Sal ammoniac
Chemical formula: NH4Cl

Ammonium dihydrogen phosphate
or piezo-electric crystal used in many transducers, produces an electric current when pressure is applied to it.

Ammonium hydroxide
Trade name: Ammonium (hydrox. of)
Chemical formula: NH4OH

See also: Chemical Table.