Question

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

• A. Show maximum covalency in their compounds
• B. Nature of oxides are amphoteric
• C. Form covalent halide
• D. Form polymeric hydride

Answer 1

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.