Notes #3: Polyatomic Naming (Ionic Bonds) WCHS Chemistry ***Get out your Periodic Table***

Polyatomic Naming Binary BINARY vs. POLYATOMIC KCN = Potassium Cyanide CaSO4 = Calcium Sulfate NaHCO3 = Sodium Bicarbonate NH4OH = Ammonium Hydroxide CaF2 = Calcium Fluoride Na3N = Sodium Nitride BaCl2 = Barium Chloride Polyatomic Naming Polyatomic Ions = Many atoms that interact as a single unit Ex: NO3-1, ClO-1 Binary 2 ions Cation (metal) 1st Anion (non-metal) 2nd = “ide” ending

NAMING POLYATOMIC IONS Cation goes first! Be careful of NH4+1 Anion goes second. PAY ATTENTION TO DETAILS! Nitrate = Nitrite = Nitride = CaCO3 __________________________ K2SO4 ___________________________ MgBr2 __________________________ Na2CO3 ___________________________ NH4OH _________________________________ NO3-1 NO2-1 N-3 Calcium carbonate Potassium sulfate Magnesium bromide Sodium carbonate Ammonium hydroxide

WRITING POLYATOMIC FORMULAS Label the charges of the ions! The total charge MUST equal ZERO! RULE: If you need 2 or more of polyatomic: Use ( ) around ONLY the (poly ion) Ex: Ca(ClO)2 Al2(SO4)3 Sodium bicarbonate _________potassium chloride ________ Sodium sulfate ____________ calcium hydroxide _________ Ammonium carbonate ____________ KCl NaHCO3 Na2SO4 Ca(OH)2 (NH4)2CO3