Question

Beryllium and aluminium exhibit many properties which are similar. But, the two elements differ in:

• A. Forming covalent halides
• B. Forming polymeric hybrids
• C. Exhibiting maximum covalency in compounds
• D. Exhibiting amphoteric nature in their oxides

Answer 1

Answer: (A)

Forming covalent halides

Due to diagonal relationship, Be and Al exhibits 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 they differ in (C) Exhibiting the maximum covalency in compounds.