NCERT Solutions for Class 9 Science Chapter 4: Structure of the Atom NCERT Solutions provided here will help students in clearing the basic concepts. These solutions have been prepared by academic experts with years of experience. We have provided answers to all exercise as well as intext questions which will aid students in their studies.
It’s a prominent chapter for students as it will help the students to prepare the base for upcoming chapters in this class. With the help of NCERT Solutions for Class 9 Science Chapter 4, students will be able to understand concepts related to the structure of the atom, its discovery, concept of a charged particle, orbital shells, valency, atomic and mass number, and various other phenomena involving the atom. It’s a prominent chapter for students as it will help the students to prepare the base for upcoming chapters in this class.
This article offers students the study source material curated by experts with in-depth knowledge of the subject. Solving NCERT solutions would allow students to score maximum marks in their exams. We have also provided you with Class 9 Science Chapter 4 Solutions PDF along with some preparation tips and practice questions.
NCERT Solutions For Class 9 Science Chapter 4: Structure Of The Atom
Chapter 4 Science Class 9 deals with the discovery and structure of an atom. Moreover, students will get to know the work of famous scientists who developed various models along with their theories. Before getting into the NCERT Solutions For Class 9 Science Chapter 4, let’s have a look at the topics and sub-topics in this chapter:
| Section | Topic Name |
| 4.1 | Charged Particles In Matter |
| 4.2 | The Structure of An Atom |
| 4.3 | How Are Electrons Distributed In Different Orbits (Shells)? |
| 4.4 | Valency |
| 4.5 | Atomic Number and Mass Number |
| 4.6 | Isotopes |
Also, Check:
NCERT Solutions For Class 9 Science Chapter 4: Solved Exercises & In-Text-Questions
Students now do not have to worry about understanding the concepts of the structure of atom via different sources. By going through the answers and explanations provided by Embibe, students can easily understand and excel in this topic. Moreover, students can view this solution here as well as download them as a PDF. The solutions for Science Chapter 4 Class 9 provided here on Embibe are solved by experts in an easy-to-understand language for all CBSE Class 9 students.
DOWNLOAD CLASS 9 SCIENCE CHAPTER 4 NCERT SOLUTIONS PDF
Download NCERT Solutions for Class 9 Science for other chapters also:
- Chapter 1: Matter in Our Surroundings
- Chapter 2: Is Matter Around Us Pure?
- Chapter 3: Atoms and Molecules
- Chapter 5: The Fundamental Unit of Life
- Chapter 6: Tissues
- Chapter 7: Diversity in Living Organisms
- Chapter 8: Motion
- Chapter 9: Force and Laws of Motion
- Chapter 10: Gravitation
- Chapter 11: Work and Energy
- Chapter 12: Sound
- Chapter 13: Why Do We Fall Ill
- Chapter 14: Natural Resources
- Chapter 15: Improvement in Food Resources
CBSE Class 9 Science Chapter 4 Questions And Answers: Chapter Description
In this chapter, you will learn about the basic terms involved in the study of an atom, such as atomic number, atomic mass, neutrons, and valency. You will also learn about the different atomic models, their features, and their limitations. The study will start with charged particles in matter, followed by the basic structure of an atom.
Thomson’s Model of an atom, Rutherford’s Model of an atom, and Bohr’s Model of an atom are explained and the limitations of these models are studied. Students will then know what are shells and orbitals. You will also be introduced to the scientists who have contributed to the study of the atom. Lastly, you will be introduced to the terms – Isotopes and Isobars.
Class 9 Science Chapter 4 Important Questions
Below we have arranged some important and extra questions that will help students in their preparation for exams:
| Short Answer Type Questions 1. Define the following: a) Atomic Number b) Mass Number c) Valency d) Isotopes e) Isobars 2. On the basis of Thomson’s model of an atom, explain how the atomic neutral as a whole. 3. Draw a sketch of Bohr’s model of an atom with three shells. 4. If K and L shells of an atom are full, then what would be the total number of electrons in the atom? |
| Long Answer Type Questions 1. For the symbol Hydrogen, Deuterium and Tritum tabulate three sub-atomic particles found in each of them. 2. Write the electronic configuration of any one pair of isotopes and isobars. 3. Compare the properties of electrons, protons and neutrons. 4. How will you find the valency of chlorine, sulphur and magnesium? 5. Describe Bohr’s model of the atom. 6. Summarise the rules for writing of distribution of electrons in various shells for the first eighteen elements. |
NCERT Class 9 Science Chapter 4 Preparation Tips
There aren’t any specific tips that will help you ace the chapter. What you can do is make a proper study timetable, be confident, make notes, solve as many questions as you can, and keep on revising. Use the NCERT solutions for Class 9 Science Chapter 4 PDF provided by us for reference whenever you get stuck.
If you follow the above tips we assure you that your marks will improve.
FAQs Related To NCERT Solutions For Class 9 Science Chapter 4
Here we have provided some of the frequently asked questions related to Class 9 Chapter 4 Science Solution:
A: As per Thompson’s model of an atom,
(i) An atom contains a positively charged sphere in which the negatively charged electrons are implanted.
(ii) Electrons and protons are equal in magnitude, hence an atom, on the whole, is electrically neutral.
A: The sketch of Bohr’s model of an atom is as follows:
A: In the ∝ – particle scattering experiment, when any other metal foil is used instead of gold, the observation would remain the same. This is because the structure of an atom when considered individually remains the same.
A: An atom consists of three subatomic particles. These are:
(i) Protons – positively charged
(ii) Electrons – negatively charged
(iii) Neutrons – neutral ( no charge )
A: H stands for Hydrogen,
D stands for Deuterium, and
T stands for Tritium
The following table illustrates the subatomic particles found in each of them:
A: The limitations of Rutherford’s model of the atom are:
- (i) There is no expected stability in the revolution of the electron in a circular orbit.
- (ii) Charged particles radiate energy when accelerated thus causing the revolving electrons to lose energy and would fall into the nucleus.
- (iii) Hence atoms must be highly unstable. Matter would not exist in their known form which clearly is an assumption as atoms are highly stable.
We hope this article on CBSE NCERT Solutions for Class 9 Science Chapter 4 (Structure of the Atom) helps you. Refer to the solutions that we have provided in this article. If you have any queries, ask us in the comment section below and we will get back to you.
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