Name:_______________________________________________________________Pd:_______Date:________________
Polyatomic Ions
1. How many potassium ions (group 1) would be needed to balance the charge of each of the following in a
compound?
a. one cyanide ion _____________________________
b. one sulfite ion _____________________________
c. one arsenate ion _____________________________
2. How many iodate ions would be needed to balance the charge of each of the following in a compound?
a. one Fe3 ion _____________________________
b. one lithium ion (group 1) _____________________________
c. one barium ion (group 2) _____________________________
3. What is the formula of the ionic compound formed by each of the following in combination? Demonstrate that
each result is correct by figuring out total positive charge and total negative charge.
a. ammonium ions and sulfate ions
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b. sodium ions and phosphate ions
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c. magnesium ions and hydrogen sulfate ions
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d. aluminum ions and carbonate ions
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e. ammonium ions and arsenate ions
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f. calcium ions and acetate ions
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g. ammonium ions and nitrite ions
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