Writing Formulas & Names For Polyatomic Compounds Page 2
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4Writing Formulas for Polyatomic Compounds
The formula writing and naming of polyatomic ionic compounds is similar to the process for binary
compounds. For example, making a compound using aluminum metal and nitrate yields:
+3
-1
Al
NO
3
+3
-1
Al
NO
3
Al(NO
)
3
3
Key Questions
1. What is the purpose of the parentheses in the compound magnesium cyanide, Mg(CN)
?
2
2. Why are the 3’s not simplified in the aluminum nitrate formula, above?
3. In the compound potassium oxalate, K
(C
O
), why are the 2’s and the 4 not simplified?
2
2
4
4. Create a chart that demonstrates how to determine the names and numbers of oxygen atoms present
in the oxyanions of a particular oxyanion series.
5. For the following polyatomic anions, write the names and formulas for all of the oxyanions
associated with them.
-1
-1
a. Chlorate, ClO
c. Iodate, IO
3
3
-1
-2
b. Bromate, BrO
d. Sulfate, SO
3
4
Exercises
6. Write the formulas for the following compounds:
a. Sodium chlorate
e. Ammonium iodide
b. Strontium sulfate
f. Indium hydroxide
c. Lithium hypoidodite
g. Rubidium hydrogen carbonate
d. Aluminum phosphate
h. Potassium tartrate
Writing Formulas & Names for Polyatomic Ionic Compounds / 2
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