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 others it resembles with group $-I$ metals. Support this statement by giving some evidences.
Thallium belongs to group $13$ of the periodic table. The most common oxidation state for this group is $+3$. However, heavier members of this group also display the $+1$ oxidation state.
This happens because of the inert pair effect. Aluminium displays the $+3$ oxidation state and alkali metals display the $+1$ oxidation state.
Thallium displays both the oxidation states. Therefore, it resembles both aluminium and alkali metals.
Thallium, like aluminium, forms compounds such as $\mathrm{TlCl}_{3}$ and $\mathrm{Tl}_{2} \mathrm{O}_{3} .$ It resembles alkali metals in compounds $\mathrm{Tl}_{2} \mathrm{O}$ and $\mathrm{TlCl}$.
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