Metallic hydrogen, which only exists at very high pressures, is known for its electrical and magnetic properties, not its chemical properties.
mətˈælɪk hˈaɪdɹədʒən, wˌɪtʃ ˈoʊnli ɛɡzˈɪsts æt vˈɛɹi hˈaɪ pɹˈɛʃɚz, ɪz nˈoʊn fɔːɹ ɪts ᵻlˈɛktɹɪkəl ænd mæɡnˈɛɾɪk pɹˈɑːpɚɾiz, nˌɑːt ɪts kˈɛmɪkəl pɹˈɑːpɚɾiz.