Two elements, Qr and E, combine to form an ionic compound whose formula is QrE2. Qr also combines with element Z to form an ionic compound, Qr3Z2. Based on this information, what is a reasonable value for the charge on E? (Assume that Qr has the same charge in both compounds.) Hint: Consider the rules for forming ionic compounds to figure out what the possible charge is. Remember ionic compounds are neutral.
A) 1+
B) 1
C) 2+
D) 2
E) 3
Correct Answer:
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