NCERT Solutions for Class 9 Science Chapter 4 Structure of The Atom

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NCERT Solutions for Class 9 Science Chapter 4 - Structure of The Atom: After going through the chapter-3 of Science you must be wondering that; What makes the atom of one element different from the atom of another element? and (ii) Are atoms really indivisible, as proposed by Dalton, or are there smaller constituents inside the atom? You will find out the answers to these questions in this chapter. We will also learn about sub-atomic particles and the various models that have been proposed to explain how these particles are arranged within the atom.

In this chapter, you will get to know that one of the first indications that atoms are not indivisible, comes from studying static electricity and the condition under which electricity is conducted by different substances.

Here are the important Topics of NCERT for Class 9 Science Chapter 4 - Structure of The Atom mentioned below:

4.1 Charged Particles in Matter

4.2 the Structure of an Atom

4.2.1 Thomson’s Model of an Atom

4.2.2 Rutherford’s Model of an Atom

4.2.3 Bohr’s Model of Atom

4.2.4 Neutrons

4.3 How Are Electrons Distributed in Different Orbits (shells)?

4.4 Valency

4.5 Atomic Number and Mass Number

4.5.1 Atomic Number

4.5.2 Mass Number

4.6 Isotopes

4.6.1 Isobars

In NCERT for Class 9 Science Chapter 4 - Structure of The Atom, you will study about important models based on atoms, like Rutherford’s model of the atom proposed that a very tiny nucleus is present inside the atom and electrons revolve around this nucleus. The stability of the atom could not be explained by this model. Neils Bohr’s model of the atom was more successful. He proposed that electrons are distributed in different shells with discrete energy around the nucleus. If the atomic shells are complete, then the atom will be stable and less reactive.

After going through this chapter, you must be able to get the NCERT Solution of these questions which are mentioned below, as these questions are from NCERT.

Q1. Describe Bohr’s model of the atom.

Q2. Compare all the proposed models of an atom given in this chapter.

Q3. Summarise the rules for the writing of distribution of electrons in various shells for the first eighteen elements.

Q4. Define valency by taking examples of silicon and oxygen.

If you have any problem in answering these questions or you are not getting the correct answers then don't worry, NCERT Solutions for Class 9 Chapter 4 - Structure of The Atom is there for you to help. Solutions for NCERT Class 9 Science Chapter 4 - Structure of The Atom will give you answers to all the questions which are mentioned in the NCERT book.

First of all, try to answer all the questions by yourself. Then, if you need any help, NCERT Solutions for Class 9 Science Chapter 4 - Structure of The Atom will suggest you the best answer written by our experts.

NCERT Solutions for Class 9 Science- Chapter Wise

 Chapter No. Chapter Name 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