Question

Why beryllium resembles with aluminium aluminium in its?

Answer 1

1) Both metals have a tendency to form covalent compounds e.g. the chlorides of both being covalent are soluble in organic solvents.

2) Both BeCl2 and AlCl3 act as a Lewis acids and are used as Friedel – Crafts catalyst.

You are here: Home / Class 11 / Chemistry / s-Block Elements / Diagonal Relationship Of Beryllium and Aluminium

 

Diagonal Relationship Of Beryllium and Aluminium

October 25, 2017 By Mrs Shilpi Nagpal 7 Comments

Beryllium shows resemblance with its diagonally opposite element aluminium.

Points of similarity are:

1) Both metals have a tendency to form covalent compounds e.g. the chlorides of both being covalent are soluble in organic solvents.

2) Both BeCl2 and AlCl3 act as a Lewis acids and are used as Friedel – Crafts catalyst.

 

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

4) BothBeCl2 and AlCl3 have chlorine bridged structures in the vapour phase.

Chlorine bridge structure of BeCl2

Chlorine bridge structure of AlCl3

5) Both Be and Al are resistant to the action of acids due to the formation of protective film of the oxides on their surface

Answer 2

╔╦══• •✠•❀•✠ • •══╦╗

ђ๏ℓล мล†э

╚╩══• •✠•❀•✠ • •══╩╝

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.

☆ɦօքɛ ʊ ʟɨᏦɛ ɨ⊺☆