Given below are two statements: one is labelled as Assertion A and...

$Tℓ{I}_{3} ⇒ \left(T{ℓ}^{⊕} \text{ and } {I}_{3}^{⊝}\right)$

${CsI}_{3} ⇒ \left({Cs}^{⊕} \text{ and } {I}_{3}^{⊝}\right)$

[Both have same crystalline structure is called isomorphous]

$T{ℓ}_{\left(81\right)}^{⊕} = \left[{Xe}_{54}\right]4{f}^{14}, 5{d}^{10}, 6{s}^{2}$

(It is correct due to present $14f$ electrons in ${Tℓ}^{⊕}$ ion)

$Tl{I}_{3}$ is $T{ℓ}^{+}{I}_{3}^{-}$

${CSI}_{3}$ is ${Cs}^{+}{I}_{3}^{-}$

Thallium shows $T{ℓ}^{+}$ state due to inert pair effect.