Molecules And Compounds - Chemistry Worksheet Page 5
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93. For polyatomic ions, where ions have different charges, also use the crossover method:
– Express more than one polyatomic ion with parentheses and subscripts.
2+
–
3+
2–
2+
3–
Sr
+ NO
Fe
+ CO
Zn
+ PO
3
3
4
EXCEPTION FOR CROSSOVER METHOD: Ions with 4+ and 2– charges!
4+
2–
Pb
+ O
Also applies to polyatomic ions!
4+
2–
Sn
+ SO
4
Ionic compound formulas have the lowest
→
ratio of elements
NOT Pb
O
but PbO
!
2
4
2
NAMING IONIC COMPOUNDS
→
Given known charges for some elements
get charge on transition metals!
→
I. If one of each (cation & anion) present
opposite but equal charges!
Example: For each of the following compounds:
1. Indicate the charge on the anion, then determine the charge on the cation given that the
compound must be neutral.
2. Name each ion then name the compound.
CuCl
FeS
CuCl
FeS
Name of
: ________________________________
Name of
: _________________________________
CHEM 139: Tro Chapter 5
page 5 of 9
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