Class 11 Chemistry The S Block Elements Similarity of beryllium and aluminium

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–.

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