Who "modernized" the periodic table?

1 Answer

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 #sqrt(nu)#, it gave a curve.

(#nu# = frequency of x rays)

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!