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The correct order of increasing ionic radii is

1. Mg 2+ < Na + < F – < O 2– < N 3–
2. N 3– < O 2– < F – < Na + < Mg 2+
3. F – < Na + < O 2– < Mg 2+ < N 3–
4. Na + < F – < Mg 2+ < O 2– < N 3–

Correct answer: Mg 2+ < Na + < F – < O 2– < N 3–

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