• # question_answer Which of the following is the correct order of ionic radii? A) $N{{a}^{+}}>M{{g}^{2+}}>A{{l}^{3+}}>S{{i}^{4+}}$ B) $S{{i}^{4+}}<A{{l}^{3+}}>M{{g}^{2+}}>N{{a}^{+}}$ C) $A{{l}^{3+}}<S{{i}^{4+}}>N{{a}^{+}}>M{{g}^{2+}}$ D) $N{{a}^{+}}<M{{g}^{2+}}<A{{l}^{3+}}<s{{i}^{4+}}$

Correct Answer: A

Solution :

More the positive charge over the cation the smaller will be the size. Hence, the correct option is (a).

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