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Ionic ReminderCation: A positive ionMg2+NH4+Anion: A negative ionCl-SO42-Define: Polyatomic Ion- an ion made up of two or more elements covalently bonded.1Polyatomic Ions

Naming Ionic Compoundscation = name of the elementCa2+ = calcium ionanion = root + -ideCl- = chloride ion

CaCl2 = calcium chlorideNaming Ionic Compounds(continued)Many transition metals can form more than one cationUse a Roman numeral to show the charge I = 1 II = 2III = 3IV = 4 V = 5

Metals with Varying chargesCopperMercuryGoldCobaltIron1++1+1+2+22++2+3+3+3LeadChromiumManganeseNickel+2+2+2+2+4+3+3+3+6+7+4Example: CuCl2

(Cu = Copper can be either Cu+1 or Cu+2)CuCl2 = Copper(II) chlorideCuCl = Copper(I) chlorideWriting Ionic Compound FormulasExample: Aluminum sulfide1. Find the charges for the cation & anionAl3+S2-2. Check to see if charges are balanced. 3. Balance charges

Not balanced!23Al2S3Writing Ionic Compound FormulasExample: Iron(III) Chloride1. Find the charges for the cation & anion2. Check to see if charges are balanced. 3. Balance charges

FeCl3Fe3+Cl-Not balanced!3Writing Ionic Compound FormulasExample: Magnesium carbonateMg2+CO32-They are balanced!1. Find the charges for the cation & anion2. Check to see if charges are balanced. MgCO3Writing Ionic Compound FormulasExample: Barium Nitrate1. Find the charges for the cation & anion2. Check to see if charges are balanced. 3. Balance charges

Ba(NO3)2Ba2+NO3-Not balanced!( )2Writing Ionic Compound FormulasExample: Zinc Hydroxide1. Find the charges for the cation & anion2. Check to see if charges are balanced. 3. Balance charges

Zn(OH)2Zn2+OH-Not balanced!( )2 Naming Covalent CompoundsName the least electronegative element firstIf there is only one atom, DO NOT use the prefix mono.If there is more than one, DO use a prefix.

Name the more electronegative element next.Use a prefix EVERYTIME on the second element!

List of Prefixes

(For Covalent Compounds only!)1 = mono2 = di3 = tri4 = tetra5 = penta6 = hexa7 = hepta8 = octa9 = nona10 = dekaP2O5 =CO2 =CO =N2O =diphosphorus pentoxidecarbon dioxidecarbon monoxidedinitrogen monoxide Naming Covalent CompoundsCompound NameCompound FormulaCarbon dioxideCO2Carbon monoxideCODiphosphorus pentoxideP2O5Dinitrogen monoxideN2OSilicon dioxideSiO2Carbon tetrabromideCBr4Sulfur dioxideSO2Phosphorus pentabromidePBr5Iodine trichlorideICl3Nitrogen triiodideNI3Dinitrogen trioxideN2O3Compound FormulaCompound NameN2O4dinitrogen tetroxideSO3sulfur trioxideNOnitrogen monoxideNO2nitrogen dioxideAs2O5diarsenic pentoxidePCl3phosphorus trichlorideCCl4carbon tetrachlorideH2Odihydrogen monoxideSeF6selenium hexafluoride