Question

State and explain modern periodic table and modern periodic law ?

Answer 1

In $1913$ Mosely through his x-ray diffraction experiments proved that the properties of elements dependant on the atomic number not on the atomic mass.

According to this the periodic law of Mendeleev and the periodic table were modified consequently the modern periodic table was prepared by arranging elements in the increasing order of atomic number. The modern periodic law states that the physical and chemical properties of elements are periodic function of their atomic number.