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Diagonal Relationship of Beryllium with Aluminium (Similarities, between Beryllium and Aluminium), , Beryllium of group 2 resembles more with Aluminium of group 3:, , + Both beryllium and aluminium occur together in the mineral, “Beryl”, 3Be0 Al20z 6SiO2, , + Both of them do not react with atmospheric oxygen and nitrogen., + Both of them do not react with water even at high temperatures., , + They do not liberate hydrogen from acid. On treatment with, concentrated nitric acid, they become passive., , + Both form polyvalent bridged hydrides of covalent nature., , |, Halides of both are polyvalent, bridged, and of low melting points., Halides are Lewis acids., , + Water hydrolyzes both nitrides liberate ammonia., , + Oxides and hydroxides of Be and Al are amphoteric. So, they react, with acid as well base., , + Both form carbide, which on hydrolysis yields Methane., + Carbonates of beryllium and Aluminum are unstable., , + Aluminium hydroxide and beryllium hydroxide react with excess, alkali to form their respective ions., , + Both these elements have the capacity to withstand the acid attack, due to the presence of an oxide film on the surface of the metal., , - Both these metals have the tendency to form complexes., , Chlorides of both these metals possess the capacity to be soluble in, organic solvents.