JEE MAIN - Chemistry (2020 - 5th September Evening Slot - No. 7)

The correct order of the ionic radii of
O2–, N3–, F , Mg2+, Na+ and Al3+ is :
N3– < O2– < F < Na+ < Mg2+ < Al3+
N3– < F < O2– < Mg2+ < Na+ < Al3+
Al3+ < Na+ < Mg2+ < O2– < F < N3–
Al3+ < Mg2+ < Na+ < F < O2– < N3–

Explanation

For isoelectronic species, as the no. of protons increases, size of ions decreases.

$$ \therefore $$ Correct order of size for isoelectronic species

Al3+ < Mg2+ < Na+ < F < O2– < N3–

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