It was expected for some time that liquid hydrogen would show metallic properties; while this has been shown to not be the case, under extremely high pressures, such as those found at the cores of Jupiter and Saturn, hydrogen does become metallic and behaves like an alkali metal; in this phase, it is known as metallic hydrogen.
ɪt wʌz ɛkspˈɛktᵻd fɔːɹ sˌʌm tˈaɪm ðæt lˈɪkwɪd hˈaɪdɹədʒən wʊd ʃˈoʊ mətˈælɪk pɹˈɑːpɚɾiz; wˌaɪl ðɪs hˈæzbiːn ʃˈoʊn tə nˌɑːt biː ðə kˈeɪs, ˌʌndɚɹ ɛkstɹˈiːmli hˈaɪ pɹˈɛʃɚz, sˈʌtʃ ɐz ðoʊz fˈaʊnd æt ðə kˈoːɹz ʌv dʒˈuːpɪɾɚ ænd sˈæɾɜːn, hˈaɪdɹədʒən dˈʌz bɪkˌʌm mətˈælɪk ænd bᵻhˈeɪvz lˈaɪk ɐn ˈælkəlˌaɪ mˈɛɾəl; ɪn ðɪs fˈeɪz, ɪɾ ɪz nˈoʊn æz mətˈælɪk hˈaɪdɹədʒən.