I know that Moseley's experience with X-Ray showed up the relationship between Z (atomic number) and the frequency of K and L X-Rays. So he could correct some Z value in the Periodic Table. Neverthless, I would like to know who for the first time found out that the sequencial numbers int that table represented the number of protons inside the nucleos. I understood that Moseley had already known the atomic numbers of the elements. I hope my question be clear because english is not my native language. Thank you.