Additionally, the thallium halides (except TlF) are quite insoluble in water, and TlI has an unusual structure because of the presence of the stereochemically active inert pair in thallium.
ɐdˈɪʃənəli, ðə θˈæliəm hˈælaɪdz ɛksˈɛpt tˌiːˈɛl ˈɛf ɑːɹ kwˈaɪt ɪnsˈɑːljuːbəl ɪn wˈɔːɾɚ, ænd tˌiːˈɛl aɪ hɐz ɐn ʌnjˈuːʒuːəl stɹˈʌktʃɚ bɪkˈʌz ʌvðə pɹˈɛzəns ʌvðə stˌɛɹɪoʊkˈɛmɪkli ˈæktɪv ɪnˈɜːt pˈɛɹ ɪn θˈæliəm.