Among Na+, Mg2+ and Al3+, the correct order of formation of ionic compounds is : (1) Al3+> Mg2+> Na+ (2) Na+> Mg2+> Al3+ (3) Mg2+> Al3+> Na+ (4) Al3+> Na+> Mg.
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Answer:
(2) Na+>Mg2+>Al3+
Explanation:
Sodium ion (Na+) is more reactive than magnesium ion (Mg2+) which in turn is more active than aluminium ion (Al3+). Also, since they have an increasing number of valence electrons, sodium can lose electrons more easily than magnesium (i.e., less ionization energy is required) and magnesium, having had less electrons than aluminium, can lose electrons more easily than aluminium. This makes sodium to make the first ionic bond, magnesium the second and aluminium the third one.
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