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