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Which of the following orders of ionic radii is correctly represented?

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By Expert Faculty of Sri Chaitanya
a
H->H>H+
b
Na+>F->O2-
c
F->O2->Na+
d
Al3+>Mg2+>N3-
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detailed solution

Correct option is A

Cations lose electrons and are smaller in size than the parent atom, whereas anions add electrons and are larger in size than the parent atom. Hence, the order is H->H>H+. For isoelectronic species, the ionic radii decreases with increase in atomic number i.e. nuclear charge. Hence, the correct orders are O2->F->Na+and N3->Mg2+>Al3+

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