Question

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Sodium reacts with a certain element to form a compound with the general formula Na2X\mathrm{Na}_2 \mathrm{X}. What would the most likely formula be for the compound formed between aluminum and element X?(12.4)X ?(12.4)

(a) Al2X\mathrm{Al}_2 \mathrm{X}

(b) AlX2\mathrm{AlX}_2

(c) Al2X3\mathrm{Al}_2 \mathrm{X}_3

(d) Al2X2\mathrm{Al}_2 \mathrm{X}_2

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We are given an element X\text{X} that forms a compound Na2X\text{Na}_2\text{X}. Note that this compound is most likely ionic, as it involves a sodium metal that readily gives up its one valence electron to form a sodium cation Na+\text{Na}^{+}.

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