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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) - PowerPoint PPT Presentation
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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)• Silver (Ag) and Sulfur (S)
KFKF
NaNa22OO
MgOMgO
AlAl22OO33
CaBrCaBr22
CsICsI
ZnIZnI22
AgAg22SS
POLYATOMIC IONSPOLYATOMIC 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
SOSO442-2- CO CO33
2-2- PO PO443-3- OH OH--
(SO(SO442-2- (CO (CO33
2-2- (PO (PO443-3- (OH (OH--
Ternary Compounds
• contain 3 or more elements • usually contain a polyatomic ion
• Look at table E – who would be bonded to what?!!!?
Formulas with polyatomicsFormulas 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)Al(SCN)33
Try a few more:
• 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
NaOHNaOH
KHCOKHCO33
MgCOMgCO33
LiNOLiNO33
CaSOCaSO44
These are more challenging:
• 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-
MgMg33(PO(PO44))22
Al(NOAl(NO33))33
Fe(OH)Fe(OH)22
HgHg22(SCN)(SCN)22
Mg(HCOMg(HCO33))22
AlAl22(C(C22OO44))33
Some of the most challenging are
• Zinc + Nitrate ion• Magnesium + Hydroxide ion• Lithium + Carbonate ion• Potassium + Sulfate ion• Calcium + Phosphate ion• Beryllium + Chlorate ion
Zn(NOZn(NO33))22
Mg(OH)Mg(OH)22
LiLi22COCO33
KK22SOSO44
CaCa33(PO(PO44))22
Be (ClOBe (ClO33))22