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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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a prefix
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What is the prefix for the number 3?
There is no special SI prefix for the number 3.
What is the number pair associated with a location on a graph called?
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