This placement is consistent with the modern practice of ordering the elements by proton number, Z, but that number was not known or suspected at the time.
ðɪs plˈeɪsmənt ɪz kənsˈɪstənt wɪððə mˈɑːdɚn pɹˈæktɪs ʌv ˈɔːɹdɚɹɪŋ ðɪ ˈɛlɪmənts baɪ pɹˈoʊtɑːn nˈʌmbɚ, zˈiː, bˌʌt ðæt nˈʌmbɚ wʌz nˌɑːt nˈoʊn ɔːɹ səspˈɛktᵻd æt ðə tˈaɪm.