However, thallium also displays the oxidation state +3, which no known alkali metal displays (although ununennium, the undiscovered seventh alkali metal, is predicted to possibly display the +3 oxidation state).
haʊˈɛvɚ, θˈæliəm ˈɔːlsoʊ dɪsplˈeɪz ðɪ ˌɑːksɪdˈeɪʃən stˈeɪt plˈʌs θɹˈiː, wˌɪtʃ nˈoʊ nˈoʊn ˈælkəlˌaɪ mˈɛɾəl dɪsplˈeɪz ɔːlðˈoʊ ʌnˌʌnɛnˈɪəm, ðɪ ʌndɪskˈʌvɚd sˈɛvənθ ˈælkəlˌaɪ mˈɛɾəl, ɪz pɹɪdˈɪktᵻd tə pˈɑːsᵻbli dɪsplˈeɪ ðə plˈʌs θɹˈiː ˌɑːksɪdˈeɪʃən stˈeɪt.