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10.1. Explain the Diagonal Relationship betweenBeryllium and Aluminium.

<p>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. Some ofthe similarities are:</p><p><strong> (i)</strong> Like aluminium, beryllium is not readily attacked by acids because of the presence of an oxide film on the surface of the metal.</p><p>&nbsp;</p><p><strong> (ii)</strong> Beryllium hydroxide dissolves in excess of alkali to give a beryllate ion, [Be (OH)₄]^2– just as aluminium hydroxide gives aluminate ion, [Al (OH)₄]^–.</p><p>&nbsp;</p><p><strong> (iii)&nbsp;</strong>The chlorides of both beryllium and aluminium have Cl^– bridged chloride structure in vapour phase. Both the chlorides are soluble in organic solventsand are strong Lewis acids. They are usedas Friedel Craft catalysts.</p><p>&nbsp;</p><p><strong> (iv)&nbsp;</strong>Beryllium and aluminium ions have strong tendency to form complexes, BeF₄^2–, AlF₆</p>

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