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Na (Sodium) has a +1 charge. Kazyan: See above, but some exotic chemistry has produced sodium ions that are negative: -1.
Between Na+ and Mg2+, the magnesium ion will have the highest charge density because it is the smaller ion. Therefore, the compounds with magnesium will have higher melting points than those with sodium. O2- has a larger charge than Cl-, so it will be more attracted to a positive ion.