Category: Ch 3 – Classification of Elements

How many elements are present in the periodic table? A total of 118 elements are present in the periodic table. What is the meaning of ionisation enthalpy? The enthalpy change associated with the removal of the original electron from an atom with a single gas in its ground surface is called as the first ionization… Continue reading FAQs

What is the difference between Modern Periodic Law and Mendeleev’s Periodic Law? What is the ionic radius? What is the atomic radius? What is isoelectronic species? Give an example. Elements in the same group have similar chemical and physical properties. 

In this chapter, we will discuss the development of the periodic table and the periodic law. The arrangement of elements in the modern periodic table is organized into eight vertical columns (groups) and seven horizontal rows (periods) based on their atomic number. Based on the electronic configuration, elements can be classified into four types in… Continue reading Introduction