Assertion :Beryllium resembles aluminium. Reason: Charge/radius ratio of $B e^{2 +}$ ion is nearly the same as that of the $A l^{3 +}$ ion.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Beryllium resembles aluminium as radius ratio of $B e^{2 +}$ ion is nearly same as $A l^{3 +}$ ion. They show the diagonal relationship.

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