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The NH4 asked about is the amonium ion, and it's written NH4+ to indicate it has a positive charge (+1). It's a cation. Wikipedia has more information on this chemically significant polyatomic ion, and you'll find that a link to that post is provided below.

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15y ago
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10y ago

NH4 in chemistry is the formula for ammonium. It consists of one nitrogen atom to 4 hydrogen atoms. It is formed when a chemical process converts ammonia with the chemical formula NH3 to ammonium.

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16y ago

Chemical formula for ammonium sulfide I believe.

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9y ago

NH4 is the name of ammonium. This compound is the ionized version of NH3, better known as ammonia, a colorless gas with a strong odor.

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15y ago

Methane. It's a gas, natural gas, actually. One of the basic fuels around the country.

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8y ago

ammonium chloride

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6y ago

ammonium fluoride

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12y ago

ammonium nitrate

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13y ago

ammonium

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11y ago

hydrazine

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Q: What does NH4 stand for in chemistry?
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