NCERT Solutions for Class 10 Science Chapter 5 Periodic Classification of Elements
NCERT Solutions for Class 10 Science Chapter 5 covers the concept of Periodic classification of Elements. In this article, we will be providing you the CBSE Class 10 Science Chapter 5 NCERT Solutions PDF for free.
All chapter 5 questions along with their solutions are to there to help you revise the complete syllabus and score higher marks. Additionally, you can also register for our free live classes with one of the best science tutor in India. Thus, students should take advantage of the free PDF provided by Toppr. We have step by step solutions for each and every question covered in the NCERT textbook.
CBSE Class 10 Science Chapter 5 Periodic Classification of Elements NCERT Solutions
Chapter 5, periodic classification of elements belongs to the unit chemical substances, theme 1, nature, and behavior. The solutions given in the PDF for the exercises and in-between exercises are given at the end of the chapters. These questions are prepared by our subject matter experts in a simple and precise way. In this chapter, students will learn about the form of elements, compounds along with mixtures. Thus, students are aware of the fact that elements contain atoms of the only type. So, chapter 5 of NCERT textbook takes students into further depths of organization and classification of these elements.
In chapter 5, periodic classification of elements, students will learn about the attempts to classify the elements. This results in grouping the elements into nonmetals and metals. Furthermore, the matter is divided into Newlands law of octaves, Dobereiners triads, etc. Also, a wonderful explanation of making order out of chaos the modern periodic table will be learned in this chapter with the help of an elaborative modern periodic table. This chapter is a part of unit 1, chemical substances and this holds a weight of 25 marks in the final exam. You will get 100% accurate NCERT solutions for class 10 science chapter 5 which is explained by our subject matter experts.
Sub-topics covered under NCERT Solutions for Class 10 Science Chapter 5 Periodic Classification of Elements
- Ex 5.1 – Making Order Out Of Chaos – Early Attempts At The Classification Of Elements
- Ex 5.1.1 – Döbereiner’s Triads
- Ex 5.1.2 – Newlands’ Law of Octaves
- Ex 5.2 – Making Order Out Of Chaos – Mendeléev’s Periodic Table
- Ex 5.2.1 – Achievements of Mendeléev’s Periodic Table
- Ex 5.2.2 – Limitations of Mendeléev’s Classification
- Ex 5.3 – Making Order Out Of Chaos – The Modern Periodic Table
- Ex 5.3.1 – Position of Elements in the Modern Periodic Table
- Ex 5.3.2 – Trends in the Modern Periodic Table.
You can download NCERT Solutions for Class 10 Science Chapter 5 by clicking on the button below
Some Questions from NCERT Solutions for Class 10 Science Chapter 5
Q1 What is the basic theme of organization in the periodic table?
Solution – The periodic table is organized to simplify and systematize the study of numerous properties of all the elements and their compounds. Similar elements are placed together dissimilar elements are separated from one another. The study is simple to remember as the properties of elements are studied in the form of groups or families having similar properties rather than studying these elements individually. The long form of the periodic table is based on the fact that the physical and chemical properties of the elements are the periodic functions of their atomic numbers (Modern periodic law). The elements are arranged in the increasing order of their atomic numbers.
Q2 Which important property did Mendeleev use to classify the element in his periodic table and did he stick to that?
Solution – The important property that Mendeleev used for the classification of elements was atomic weight. He arranged all known elements in the form of the periodic table. Some of the elements did not fit very well if the order of atomic weight was strictly followed. For these elements, he ignored the order of atomic weight (as atomic weight measurements can be incorrect) and placed the elements with similar properties together. Thus, iodine having lower atomic weight than tellurium (of group VI) was placed in group VII along with fluorine, chlorine, and bromine due to similar properties and left some gaps for undiscovered elements. By considering the properties of the adjacent elements, he predicted the properties of undiscovered elements. Later on, these elements were discovered and their properties were similar to those predicted by Mendeleev. Thus, Mendeleev left gaps for gallium and germanium. He named these elements as eka-aluminum and eka-silicon. When these elements were discovered, their properties were similar to those predicted by Mendeleev.
Q3 What is the basic difference between the Mendeleev’s Periodic Law and the Modern Periodic Law?
Solution – As per Mendeleev’s Periodic Law, the physical and chemical properties of the elements are a periodic function of their atomic weight. Whereas as per the Modern Periodic Law the physical and chemical properties of the elements are a periodic function of their atomic number.
Q4 On the basis of quantum numbers, justify that the sixth period of the periodic table should have 32 elements.
Solution – In the sixth period (n = 6) of the periodic table, 6s, 4f, 5d, and 6p orbitals are filled in the increasing order of the energy. Total 16 orbitals are available each of which contains a maximum 2 electrons. Thus, the sixth period can accommodate a maximum of 32 elements.
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