Naming Ions and Naming Ions and Writing Formulas for Writing Formulas for

Ionic CompoundsIonic Compounds

Monoatomic ionsMonoatomic ions single atom with a chargesingle atom with a charge Cation - + charge from losing e-Cation - + charge from losing e- Anion - - charge from gaining e-Anion - - charge from gaining e-

Cations are the name of the element. For Cations are the name of the element. For example:example:

Na+Na+ sodium ionsodium ionMgMg2+2+ magnesium ionmagnesium ion

Anions change the ending to Anions change the ending to –ide–ide. For example:. For example:OO2-2- oxoxideide Cl-Cl- chlorchlorideide

Polyatomic ionsPolyatomic ions composed of more than one atomcomposed of more than one atom

-1 Charge-1 Charge Acetate Acetate CHCH33COO- or COO- or

CC22HH33OO22-- NitriteNitrite NONO22-- NitrateNitrate NONO33-- CyanideCyanide CN-CN- HydroxideHydroxide OH-OH- HypochloriteHypochlorite ClO-ClO- ChloriteChlorite ClOClO22-- ChlorateChlorate ClOClO33-- PerchloratePerchlorate ClOClO44--

-2 Charge-2 Charge SulfiteSulfite SOSO33

2-2-

SulfateSulfate SOSO442-2-

CarbonateCarbonate COCO332-2-

-3 Charge-3 Charge PhosphatePhosphate POPO44

3-3-

+1 Charge+1 Charge AmmoniumAmmonium NHNH44

++

NAMING/WRITING NAMING/WRITING BINARY IONIC BINARY IONIC COMPOUNDSCOMPOUNDS

Binary – compound made of two Binary – compound made of two kinds of elementskinds of elements

Examples: NaCl, MgBrExamples: NaCl, MgBr22, FeI, FeI33

Writing the Writing the formulasformulas

Cation (+) firstCation (+) first Anion (-) lastAnion (-) last ““criss-cross” criss-cross”

methodmethod

Naming the Naming the formulasformulas

Cation (+) firstCation (+) first Anion (-) lastAnion (-) last

Examples:Examples: NaCl NaCl

sodium chloridesodium chloride MgBrMgBr22

magnesium magnesium bromidebromide

FeIFeI33

iron iodideiron iodide

NAMING/WRITING NAMING/WRITING COMPOUNDS WITH COMPOUNDS WITH POLYATOMIC IONSPOLYATOMIC IONS

Writing the formulasWriting the formulas Cation (+) firstCation (+) first Anion (-) lastAnion (-) last ““criss-cross” methodcriss-cross” method

Naming the formulasNaming the formulas Cation (+) firstCation (+) first Anion (-) lastAnion (-) last

Examples:Examples: NHNH44ClCl

ammonium ammonium chloridechloride

Ca(OH)Ca(OH)22

calcium hydroxidecalcium hydroxide NaNa22SOSO44

sodium sulfatesodium sulfate

Stock SystemStock Systemusing Roman numerals in using Roman numerals in

nomenclaturenomenclature Used for Used for transition metalstransition metals with more than one with more than one

possible charge (there are others)possible charge (there are others)

FOR EXAMPLE:FOR EXAMPLE:

FeClFeCl22 and FeCl and FeCl33 are both iron chloride. are both iron chloride.To differentiate, use the stock system:To differentiate, use the stock system: FeClFeCl22 = iron (II) chloride = iron (II) chloride FeClFeCl33 = iron (III) chloride = iron (III) chloride

Any element to the left of the zig-zag line Any element to the left of the zig-zag line exceptexcept groups 1 and 2, Al, Ga, Zn, In, Cd, and groups 1 and 2, Al, Ga, Zn, In, Cd, and AgAg

Hinge Questions:Hinge Questions:

Write the names for these Write the names for these formulas.formulas.

CaICaI22

NiONiOAlAl22SS33