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In some reactions thallium resembles alu...

In some reactions thallium resembles aluminium, whereas in others it resembles with group - I metals. Support this statement by giving some evidences.

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Both thallium and aluminium belong to group - 13 and thus have a general electronic configuration of `ns^2 np^1`. Both Al and Tl exhibit + 3 oxidation statems and form compounds like `AlCl_3 and TlCl_3` respectively. Both of them form octahedral ions like `[AlF_6]^(3-) and [TlF_6]^(3-)`. Again, due to inert pair effect, Tl shows oxidation state like the alkali metals of group -1 and forms `TlCl, Tl_2O, TlClO_4`, etc. TlOH like alkali metal hydraxides, dissolve in water to form solutions that are stronglyallkaline in nature. Again, `Tl_2CO_3` is water soluble and `Tl_2SO_4` forms alum like that of the alkali metals.
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