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I assume you're talking about prefixes in chemistry. When naming covalent, or molecular compounds, prefixes are necessary because there are different ways that the non-metals can bond with other non-metals. Here are the prefixes most often used in covalent compounds:

mono=1

di=2

tri=3

tetra=4

penta=5

hexa=6

hepta=7

octa=8

nona=9

deca=10.

For example, N2O4 is "dinitrogen tetroxide."

*A noteworthy exception: if there's only one of the first atom, you DON'T use the mono-prefix; you simply don't use a prefix. Example: carbon monoxide means one carbon, one oxygen.

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12y ago

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