Explain Classification of ElementsElements An element is a substance which cannot be split up into two or more simpler substances by the usual chemical methods of applying heat, light or electric energy. An element cannot be split up into two (or more) …

What are the types of Pure substances and MixturesAll the matter around us is not pure. The matter around us is of two types. In the previous chapter, we have learnt about the three states of matter. Before, understanding the chemical nature of matter, …

What is the Need for Classification of Elements?Need of Classification : It is difficult to study each and every element individually and to know its properties and uses. Therefore, they have been classified into groups on the basis of their similaritie…

Modern Periodic Table and Its SignificanceModern Periodic Table : Henry Moseley, an English physicist found that the atomic number (Z) was the fundamental property of an elements and not the atomic mass for classification of elements. Modern Periodic L…