Question

Define the moden periodic law. Discuss the
Construction of the
long
form of the periodic table
​

Answer 1

Modern Periodic Law: This law states that, the physical and chemical properties of the elements are the periodic function of their atomic numbers'. Main features of the long form of the Periodic Table are given as below: (i) This periodic table has 18 vertical columns called the groups, which are numbered from 1 to 18.

Answer 2

Properties of elements are a periodic function of their atomic masses.