The fifth and the last chapter of the book " Periodic Classification of Elements" teaches about the classification of elements periodically. In this lesson, the students learn about the 115 elements that have been classified in the periodic table according to their properties in different groups and periods. Many scientists tried grouping the elements according to their unique properties. First, it was Dobereiner's triads, and then it was Newland's law of Octaves. But all the theories had their own set of drawbacks. When finally, Mendeleev came up with his theory, it was widely accepted by the scientific community. The Mendeleev's Periodic table was further worked upon, and the new Long-form of Periodic table was later accepted, and it is still in use today. This chapter includes the arrangement of all the elements according to their properties in a definite manner.
The chapter is written in an easy and simple language so that all the students can well understand it. The chapter has a varied range of question banks so that the learning capacity of a student can be fairly evaluated. The set of questions include short, very short, long, fill in the blanks, and Multiple-Choice Questions. It also includes pictorial and diagrammatic representation so that the learning process becomes a lot interesting and the student does not get bored. The answers to the questions in the Lakhmir Singh Solutions by the Aakash Institute have been prepared by very experienced teachers and professionals who design the answers to instil a thorough understanding of the topic and a clear understanding of the student's mind. The students need to read the Lakhmir Singh textbook and then go through all the questions in Lakhmir Singh Solution for Class 10 Chemistry. This will prepare the students for their upcoming CBSE examination. The solutions are designed to have a clear idea of the basics and do not find it a problem to understand the concepts in higher classes.