An old idea called Prout's hypothesis had postulated that the elements were all made of residues (or "protyles") of the lightest element hydrogen, which in the Bohr-Rutherford model had a single electron and a nuclear charge of one.
Sebuah ide lama yang disebut hipotesis Prout telah mendalilkan bahwa semua unsur terbuat dari residu (atau "protile") dari unsur hidrogen yang paling ringan - yang dalam model Bohr-Rutherford memiliki satu elektron dan satu muatan nuklir satu.