In the modern periodic table the elements are arranged according to their?
Atomic number, which really represents the number of protons.
Who arranged the elements on the periodic table according to their physical and chemical properties?
Mendeleev arranged the elements in the increasing order of their atomic masses. In the modern periodic table, the elements are arranged in the increasing order of the atomic numbers. The f block elements present in the modern table were not discovered during Mendeleev's time and are absent in Mendeleev's table.