Chemistry Question: Correct Chemical Formula for AgZ Compound Explained

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The correct chemical formula for the compound AgZ is determined by the charge of the silver ion (Ag+), which is +1. Consequently, the anion Z must have a charge of -1 to maintain charge neutrality in the ionic compound. Among the options provided, CaZ2 and Al2Z3 are not valid because they require Z to have a charge of -2 and -3, respectively. The only valid formula for Z with a -1 charge is NaZ3, which is not a direct match but indicates the importance of charge balance in ionic compounds.

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If an element Z forms a compound with the formula AgZ, which of the following is a correct chemical formula?

-CaZ2
-Al2Z3
-H2Z
-NaZ3

I don't really understand this at all and there is going to be decent amount of them on my final exam! please any help
 
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Think charges. Since AgZ is an ionic compound, what charge must the Z have? How does this charge tell you whether a certain compound (CaZ2, Al2Z3, etc) is possible?
 
CaZ2

Ag ion has a charge of +1 which mean the charge on the Z anion must be -1.

Ca ion has a charge of +2, so it takes two Z anions to bond with it.
 
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