Asked in 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?
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.