Tag: Modern Periodic Law

Mendeleev and Modern Periodic Law: Mendeleev Periodic Law: The physical and chemical properties of elements are a periodic function of their atomic weights. Important Points: Eight vertical columns called groups. These are numbered as I, II, III, IV, V, VI, VII, VIII. Each group is further divided into two sub-groups ‘A‘ and ‘B‘. ‘A‘ group

Modern Basis of Classification of Elements: Knowledge of the structure of the atom led to the discovery of a new property of the elements called the atomic number. The atomic number of an element is equal to the number of protons in its atom. It is also equal to the number of electrons present in