Question

among al3+,n3-,mg2+, which has smallest size
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Answer 1

Answer:

n3- answer is n3-has smallest size

Answer 2

As  we know that all of them are isoelectronic species that is they contain same number of electrons so the one with most positive charge is smallest because of Greater effective nuclear charge and as small size due to this and one with highest negative charge has the biggest size because of lesser effective nuclear charge,

so the correct answer is:

 N3- > Mg2+ >Al3+