Beryllium and aluminium show many same characters but in which way these differ to each other:

Show maximum covalency in their compounds

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Nature of oxides are amphoteric

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Form covalent halide

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Form polymeric hydride

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Solution

The correct option is A Show maximum covalency in their compounds
Due to diagonal relationship Be and Al exhibit many similar properties but covalency of Be is 4 because it has an absence of d-orbital whereas, covalency of Al is up to 6 due to the presence of vacant d-orbital.
Hence option A is correct answer.

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