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Chemistry 130 Nomenclature


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Monoatomic cations
parent element + "ion"
if variable charge, parent element + (Roman Numeral charge) + "ion"
Monoatomic anions
Parent element + -ide + "ion"
Polyatomic ions (not compounds!)
1. -ate, -ite ions contain oxygen
2. -ite has one fewer O atoms than -ate means hydrogen
4. per- has one more O atoms than -ate
5. Hypo- has one less atom than -ite alone
Binary compounds with fixed charge cation (neutral charge!)
-name cation
-name anion
-use root of anion name + "-ide"
Binary Compound with multiple charge cation
-name cation
-multiple subscript of anion by its charge, and divide by cation subscript
-this is the cation roman numeral(charge)
-name the anion root + -ide
Covalent Binary compounds (two non-metals)
-use greek prefixes
-leading name does not use mono-
-name the first element plus prefix for number of atoms
-name the second element plus prefix + -ide
Compounds with polyatomic ions (neutral charge!), naming from formula
-do not use greek
-determine if cation is of variable charge
-if so, determine total charge of polyatomic ion by multiplying the charge of the polyatomic ion by the number of atoms present
-the cation must balance this charge, so that is the Roman Numeral for cation
-name the cation
-name the polyatomic ion
Compounds with polyatomic ions (neutral charge!), formula from name
-determine charge of cation
-determine charge of polyatomic ion
-use charge crossing to determine subscripts
-must used LCM subscripts
Binary acids
-use prefix hydro- + name root of anion and suffix -ic
Ternary acids
-name the polyatomic ion
-change -ate to -ic
-change -ite to -ous
-add "acid"
-include proper prefixes for polyatomic ion!

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