The first ionisation energy of hydrogen (1312.0 kJ/mol) is much higher than that of the alkali metals.
ðə fˈɜːst ˌaɪənəzˈeɪʃən ˈɛnɚdʒi ʌv hˈaɪdɹədʒən wˈʌn θˈaʊzənd θɹˈiːhˈʌndɹɪd twˈɛlv.zˈiəɹoʊ kˈeɪ dʒˈeɪ slˈæʃ mˈɑːl ɪz mˈʌtʃ hˈaɪɚ ðɐn ðæt ʌvðɪ ˈælkəlˌaɪ mˈɛɾəlz.