Polyatomic Ions Reference Sheet Page 2
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1
2Greek Prefixes
When naming molecular compounds (those composed of two nonmetals), we use the
appropriate Greek prefix and change the ending of the second nonmetal to “–ide”.
Number
Prefix
Number
Prefix
1
mono-
6
hexa-
st
(don’t use with 1
nonmetal)
2
di-
7
hepta-
3
tri-
8
octa-
4
tetra-
9
nona-
5
penta-
10
deca-
The preferred form of monooxide is “monoxide”.
Naming Acids
Acid formulas always begin with H and end with (aq) meaning they are in aqueous
+
solution (dissolved in water). Acids are basically anions combined with one or more H
ions. Figure out the name of the anion to name the acid, or vice-versa.
Anion Ending
Acid Name
root-ide
hydro- root -ic acid
root-ate
root-ic acid
root-ite
root -ous acid
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