Lithium fluoride (LiF) is the only alkali halide that is not soluble in water, and lithium hydroxide (LiOH) is the only alkali metal hydroxide that is not deliquescent.
lˈɪθiəm flˈʊɹɹaɪd lˈaɪ ˈɛf ɪz ðɪ ˈoʊnli ˈælkəlˌaɪ hˈælaɪd ðæt ɪz nˌɑːt sˈɑːljuːbəl ɪn wˈɔːɾɚ, ænd lˈɪθiəm haɪdɹˈɑːksaɪd lˈaɪ ˌoʊˈeɪtʃ ɪz ðɪ ˈoʊnli ˈælkəlˌaɪ mˈɛɾəl haɪdɹˈɑːksaɪd ðæt ɪz nˌɑːt dᵻlɪkwˈɛsənt.