Which one of the following has the smallest size?

A l

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A l^{+}

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A l^{+ 2}

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A l^{+ 3}

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Solution

The correct option is A $A l^{+ 3}$
The size of the atom decreases as the positive charge on the atom increases because of increased nuclear pull on outer electrons. Hence, the correct order of atomic size will be $A l^{3 +} < A l^{2 +} < A l^{+} < A l$ .

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