NCERT Solutions for Class 9 Science Chapter 4- Structure Of The Atom

NCERT Solutions For Class 9 Science Chapter 4 PDF Free Download

NCERT solutions for Class 9 science at BYJU’S provides students with solutions to all the questions provided in the NCERT Class 9 textbook which is on the lines of CBSE board. This article provides students with the study source material that is crafted by a team of experts with in-depth knowledge of the subject. Solving NCERT solutions would enable students to score maximum marks at the CBSE exam.

The language used while preparing solutions by our experts at BYJU’s is proficient and to the understanding of the class 9 students thereby assisting the students in understanding the concept better which is established on the concept based approach. While preparation of solutions, the answering method that is promoted by the CBSE and hence the allotment of marks in examinations is taken into consideration for students to layout their answers correspondingly and hence to score maximum marks. The NCERT textbook provided by the board is designed by the panel taking into consideration the latest in the field of science and technology.

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NCERT Solutions for class 9 Science Chapter 4 – Structure Of The Atom

NCERT Class 9 Science Chapter 4 – Structure of the atom is categorized under Unit I – Matter – Its nature and behaviour which fundamentally deals with the physical nature of matter and what constitutes the particles that make up for matter. The whole unit of Matter makes up for 23 marks out of which Structure of the atom chapter is allocated 10 marks. In order to score maximum marks, students practice NCERT solutions.

This chapter has a good weightage. Thorough knowledge of all the concepts covered in this chapter will help you achieve up to 10 marks from this chapter alone. Around 2 questions with 5 marks each appear in the examination from this chapter and are expected to appear in the following year too.

List of subtopics covered in Chapter 4 – Structure Of The Atom:

Number

Subtopic

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 an 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

List of Exercise

Number 4.1 – Charged particles in matter 2 Question ( 2 short)

Number 4.2 – The structure of an atom 4 Question ( 4 short)

Number 4.2.4 – Neutrons 2 Question ( 2 short)

Number 4.3 – How are electrons distributed

in different orbits(shells)? 2 Question ( 1 long, 1 short)

Number 4.4 – Valency 1 Question ( 1 long)

Number 4.5 – Atomic number and mass number 2 Question ( 2 long)

Number 4.6 – Isotopes 2 Question ( 1 long, 1 short)

Exercise Solutions – 19 Question ( 6 long, 9 short, 4 MCQ)

NCERT Solutions for class 9 Science Chapter 4 – Structure of the Atom

In this chapter, we get enlightened about the discovery of electrons and protons that is credited to J.J. Thomson and E.Goldstein respectively. As per the theory by J.J.Thomson, electrons are implanted in the positive sphere. The discovery of the atomic nucleus was forwarded by Rutherford’s alpha-particle scattering experiment. We also learn about how Neil Bohr’s model was successful as he explained how electrons are distributed in different orbits around the nucleus.

This chapter also briefs about the discovery of neutrons in an atom proposed by J.Chadwick, hence the conclusion about the existence of three sub-atomic particles i.e., protons, neutrons, and electrons. It also shed light upon concepts such as valency, atomic number, and mass number which are essential to identify elements and their behavioural properties.

Overall, it helps us answer the basic concepts of what sets an atom apart from atoms of other elements, the indivisibility concept of atoms, representation of elements through mass number and atomic mass, and the basic constituents of an atom

Key Features of NCERT Solutions for class 9 Science Chapter 4 – Structure of The Atom

  • NCERT solutions enable students to prepare for CBSE Class 9 examination stress-free.
  • Calculations and electronic configurations have been explained in detail while solving
  • Diagrams have been used wherever necessary to be able to learn visually
  • Numericals involving finding valency of elements have been worked out in detail.
  • Comparison questions involve the use of tables to help learn and understand better
  • Pointers have been used in the solutions to remember at a glance