Similarity of beryllium and aluminium
- The charge/radius ratio of Be2+ ion is nearly the same as that of the Al3+ ion and hence exhibit similar properties.
- Both remains unaffected by acids due to the presence of an oxide film on the metallic surface.
- Hydroxide of both the elements dissolves in excess of alkali to produce beryllate ion[Be (OH)4]2– and aluminate ion [Al(OH)4]–
- Chlorides of both the elements are soluble in organic solvents and act as strong Lewis acids
- The ions of both the elements have strong tendency to form complexes like BeF42–, AlF63–.