Question

The problem with elements being arranged in the increasing order of atomic masses is that the atomic mass does not increase in a regular manner in going from one element to next. So, it is not possible to predict how many elements could be discovered between the elements. This is why in the Modern Periodic Table elements are arranged according to their ___.

Answer 1

Elements, when arranged in order of increasing atomic number Z, leads us to the classification known as the Modern Periodic Table. Prediction of properties of elements could be made with more precision when elements were arranged on the basis of increasing atomic number.