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Question

anonymous · Answer

f the formula for a compound is represented by X2Y3 and the charge on the Y ion is -2, what is the charge in the X ion?

 +1
 +2
 +3
 +4

anonymous · Answer

@jebonna

jebonna · Answer

When making ionic compounds, the charges of each ion is swapped around and is put as sub-script on the bottom of the other element when written out as a compound.

So if Y had a charge of -2, X will have a sub-script of 2, which it does have.
So of course if Y has a negative charge, we know X will be positive (as negative and positive ions attract)
So if Y has a sub-script of 3, if we swap that around in reverse, that means X must have had a charge of +3

So the answer is +3 
I hope this helps :)