Which of the following has the largest 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 B $A l$
A cation is formed by removing an electron from a neutral atom. Since there are lesser number of electrons, the cation will have a greater effective nuclear charge as compared to the neutral atom. Hence the electrons will get attracted closer to the nucleus. Therefore, the radius of the cation is always smaller than that of the neutral atom. By the above reasoning, $A l$ has the largest radius in this case.

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