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Ionic Nomenclature

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Rules for FormulasAll atoms must achieve stable electron

configuration (full valence)The formula must be electrically neutral

The sum of the positive and negative charges must equal zero

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How do we name our formulas?

Name the cation first, then the anionDo not include the numbers in the nameAdd an –ide ending to the anionExample:

BaCl2 = Barium Chloride

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Transition MetalsForm more than one type of cationMust use Roman Numerals to distinguish

which cation is in the formulaRoman Numerals are ONLY used in the

NAME, not in the formulaThe Roman Numeral stands for the

charge on the cation, NOT THE SUBSCRIPT in the formula

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Formula vs. NameFeN = Iron (III) Nitride

Cu2O = Copper (I) OxideSnO = Tin (II) Oxide

SnO2 = Tin (IV) Oxide

KomperdaHow do I figure out what to name it?

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Polyatomic IonsCovalently bonded group of atoms that has a

positive or negative charge and acts as a unit or ion.

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Polyatomic ions (-1 charge)H2PO4 DiHydrogen phosphateC2H3O2 AcetateHSO3 Hydrogen SulfiteHCO3 Hydrogen CarbonateNO2 NitriteNO3 NitrateCN CyanideOH HydroxideMnO4 PermanganateClO HypochloriteClO2 ChloriteClO3 ChlorateClO4 Perchlorate

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Polyatomic ions (-2 charge)HPO4 Hydrogen PhosphateC2O4 OxalateSO3 SulfiteSO4 SulfateCO3 CarbonateCrO4 ChromateCr2O7 DichromateSiO3 Silicate

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Polyatomic ions (-3 charge)PO3 PhosphitePO4 Phosphate