Who "modernized" the periodic table?
Moseley mordernized the periodic table by changing the old law of periodicity based on his observations of x-ray diffraction.
When Moseley plotted a graph of atomic weight against
However, with atomic number, it gave a straight line.
This indicated that atomic number is a more fundamental property than atomic weight.
Thus, Mendeleev's periodic law was changed to the modern periodic law that states:
The physical and chemical properties of an element are a periodic function of their atomic numbers.
I hope that helps!