Question

Why does beryllium show resemblance with aluminium?

Answer 1

The ionic radius of Be2+ is estimated to be 31 pm, the charge /radius ratio is nearly the same as that of the Al3+ ion. Hence beryllium resembles aluminium in some ways.

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Answer 2

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Beryllium (Be) shows resemblance with its diagonally opposite element Aluminium (Al).

Similarities are:

(1) Both metals have a tendency to form covalent compounds. Example: The chlorides of both being covalent are soluble in organic solvents.

(2) These two elements have same electronegativity and the polarising power i.e. charge/ radius ratio of their ions are very similar.

(3) Both BeCl2 and AlCl3 act as Lewis acid.

(4) Both metals dissolve in strong alkalies to form soluble complexes.

(5) The oxides of both Be(BeO) and Al(Al2O3) are hard, high melting insoluble solids.

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