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Elements and Compounds

How does the size of a magnesium ion with a 2 plus charge compare with that of a sodium ion with a single plus charge?

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September 16, 2012 5:29AM

The Na+ will have a larger size (atomic radius) while Mg2+ will have relatively smaller size. Both elements have lost their valence (outermost) electrons and achieve a stable octet state as ions. what makes a difference is the effective nuclear charge. because Mg has a higher nuclear charge, the valence electrons are pulled more towards the nucleus thereby reducing the atomic radius.