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

In some of the reactions thallium resembles aluminium, whereas in othe

1.	In some of the reactions thallium resembles aluminium, whereas in others it resembles with group I metals. Support this statement by giving some evidences.
Answer» Solution :Similar to aluminium, thallium shows +3 oxidation STATE in compounds like `Tl_2 O_3, TlCl_3, Tl_2 (SO_4)_3`, ETC. It FORMS complex `[TIF_6]^(3-)` similar to that formed by aluminium,`[AlF_6]^(2-)` Due to inert-pair effect, it also exhibits oxidation state of +1 as exhibited by ALKALI metals of group 1. Some of its compounds formed in this state are `Tl_2 O , TlCl` etc., which are similar to the compounds like `Na_2 O, NACL` etc. Like `Na_2 O, Tl_2 O` is strongly basic. Thus, it resembles group 1 metals also.