Which of the following is the most likely to react with Magnesium (Mg)?

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Correct Answer: D. Cl
Electronegativity increases to the right of the periodic table, and also from bottom to top. We note that chlorine is the closest to the upper right of the periodic table, meaning it is the most electronegative of the available choices. Thus, it is the most likely to react with Mg, which normally carries a 2+ charge.
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