Question

Beryllium and aluminium exhibit many properties which are similar. But, the two elements differ in
(a) exhibiting maximum covalency in compounds
(b) forming polymeric hydrides
(c) forming covalent halides
(d) exhibiting amphoteric nature in their oxides.

Answer 1

(a) : Beryllium has the valency +2 while aluminium exhibits its valency as +3.