The formulas for several ionic compounds are shown below, with X representing an unidentified main group element. Match each formula with the group to which the element X must belong.         Na2X           Al2X3           XCO3           XBr2           (NH4)2X   A   2A(2) B   3A(13) C   6A(16) D   1A(1) E   8A(18) F   7A(17)

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