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Topic: Polyatomic Ions Do Now: Review, write the binary ionic formula for:

Topic: Polyatomic Ions Do Now: Review, write the binary ionic formula for:. Potassium (K) and Fluorine (F) Zinc (Zn) and Iodine (I) Sodium (Na) and Oxygen (O) Magnesium (Mg) and Oxygen (O) Aluminum (Al) and Oxygen (O) Calcium (Ca) and Bromine (Br) Cesium (Cs) and Iodine (I)

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Topic: Polyatomic Ions Do Now: Review, write the binary ionic formula for:

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  1. Topic: Polyatomic IonsDo Now: Review, write the binary ionic formula for: • Potassium (K) and Fluorine (F) • Zinc (Zn) and Iodine (I) • Sodium (Na) and Oxygen (O) • Magnesium (Mg) and Oxygen (O) • Aluminum (Al) and Oxygen (O) • Calcium (Ca) and Bromine (Br) • Cesium (Cs) and Iodine (I) • Silver (Ag) and Sulfur (S) KF ZnI2 Na2O MgO Al2O3 CaBr2 CsI Ag2S

  2. SO42- CO32- PO43- OH- (SO42- (CO32- (PO43- (OH- POLYATOMIC IONS • group of covalently bonded atoms that have a charge • Table E: (+)’ve or (–)’ve • polyatomic ions have “names” • (-) polyatomic ions can form ionic bonds with (+) metal ions

  3. Ternary Compounds • contain 3 or more elements • usually contain a polyatomic ion • Look at table E – who would be bonded to what?!!!?

  4. Formulas with polyatomics • What’s the formula for the compound formed from Al and SCN? • The charges must add up to zero, so write the symbols, positive first! Al(SCN)3

  5. Try a few more: NaOH • Na+1 and OH-1 • K +1 and HCO3-1 • Mg+2 and CO3-2 • Li +1 and NO3-1 • Ca+2 and SO4-2 KHCO3 MgCO3 LiNO3 CaSO4

  6. These are more challenging: Mg3(PO4)2 • Mg+2 and (PO4)-3 • Al+3 and (NO3)-1 • Fe+2 and OH-1 • Hg2+2 and SCN-1 • Mg+2 and HCO3- • Al+3 and C2O42- Al(NO3)3 Fe(OH)2 Hg2(SCN)2 Mg(HCO3)2 Al2(C2O4)3

  7. Some of the most challenging are Zn(NO3)2 • Zinc + Nitrate ion • Magnesium + Hydroxide ion • Lithium + Carbonate ion • Potassium + Sulfate ion • Calcium + Phosphate ion • Beryllium + Chlorate ion Mg(OH)2 Li2CO3 K2SO4 Ca3(PO4)2 Be (ClO3)2

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