It had been immediately apparent from the work of Moseley that the nuclei of heavy atoms have more than twice as much mass as would be expected from their being made of hydrogen nuclei, and thus there was required a hypothesis for the neutralization of the extra protons presumed present in all heavy nuclei.
ɪt hɐdbɪn ɪmˈiːdɪətli ɐpˈæɹənt fɹʌmðə wˈɜːk ʌv mˈoʊsli ðætðə nˈuːklɪi ʌv hˈɛvi ˈæɾəmz hæv mˈoːɹ ðɐn twˈaɪs æz mˈʌtʃ mˈæs æz wʊd biː ɛkspˈɛktᵻd fɹʌm ðɛɹ bˌiːɪŋ mˌeɪd ʌv hˈaɪdɹədʒən nˈuːklɪi, ænd ðˈʌs ðɛɹwˌʌz ɹᵻkwˈaɪɚd ɐ haɪpˈɑːθəsˌɪs fɚðə nˌuːtɹəlᵻzˈeɪʃən ʌvðɪ ˈɛkstɹə pɹˈoʊtɑːnz pɹɪzˈuːmd pɹˈɛzənt ɪn ˈɔːl hˈɛvi nˈuːklɪi.