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Identify the correct order of increasing ionic sizes

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a
Al3+<O2<F<Cl
b
F<O2<Cl<Al3+
c
Al3+<F<O2<Cl
d
Al3+<F<Cl<O2

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detailed solution

Correct option is C

The electronic configurations of the given ions are

Al3+:(1s)2(2s)2(2p)6 F:(1s)2(2s)2(2p)6

O2:(1s)2(2s)2(2p)6 Cl: (1s)2(2s)2(2p)6(3s)2(3p)6

The size of Cl- will be the largest as its outer shell belongs to the quantum number n = 3. Of the remaining species,

Al3+ will have the minimum ionic size because of three positive charge and O2-will have maximum ionic size because of two negative charge.

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