Two Elements, Qr and E, Combine to Form an Ionic

Multiple Choice

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