# Who "modernized" the periodic table?

Jul 30, 2017

Moseley mordernized the periodic table by changing the old law of periodicity based on his observations of x-ray diffraction.

#### Explanation:

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!