In a given sample of uranium, there is estimated to be only one francium atom for every 1018 uranium atoms.
ɪn ɐ ɡˈɪvən sˈæmpəl ʌv jʊɹɹˈeɪniəm, ðɛɹ ɪz ˈɛstᵻmˌeɪɾᵻd təbi ˈoʊnli wˈʌn fɹˈænsiəm ˈæɾəm fɔːɹ ˈɛvɹi wˈʌn θˈaʊzənd ˈeɪtiːn jʊɹɹˈeɪniəm ˈæɾəmz.