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Na+, Mg2+, Al3+ and Si4+ are isoelectronic, their ionic size will follow the order

(a) Na+ > Mg2+ < Al3+ < Si4+

(b) Na+ < Mg2+ < Al3+ < Si4+

(c) Na+ > Mg2+ > Al3+ > Si4+

(d) Na+ < Mg2+ > Al3+ < Si4+

1 Answer

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Best answer

The correct option is: (c) Na+ > Mg2+ > Al3+ > Si4+

Explanation:

In isoelectronic species as the charge on cations increases. their sizes decrease in that order. Thus the ionic sizes of the given cation (isoelectronic) decrease in the order:

Na+ > Mg2+ > Al3+ > Si4+

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