4. Structure of The Atom-Non-atomic particles Science Class 9 In English-CBSE Notes
Last Updated : 14 March 2026
Explore science cbse notes for Class 9 Chapter 4. Structure of The Atom Topic Non-atomic particles in English medium for exams preparation.
4. Structure of The Atom-Non-atomic particles Science Class 9 In English-CBSE Notes
Last Updated : 14 March 2026
4. Structure of The Atom-Non-atomic particles Science Class 9 In English-CBSE Notes
4. Structure of The Atom
Non-atomic particles
Chapter 4: The Structure of Atom
Atom: The smallest tiny particles of matter is called atom.
There are three subatomic particles.
(i) Protron
(ii) Neutron
(iii) Electron
The two particles of these particles are charged.
(i) Protron: It is positively charged particle which is situated inside the nucleus od an atom. It shows all the chemical properties of an atom. Increasing or decreasing the number of protons of an atom caused changing in chemical properties.
- Protons are represented by p+ .
- The Mass of a proton is about 2000 times larger than electrons.
- The mass of a proton is taken 1 unit and it's charge is taken +1.
- It cann't be peeled off easily from nucleus as it located inside the nucleus. if we try to peel off nucleus can break.
The discovery of Proton was made by E. Goldstein.
(ii) Electrons: These are negatively charged (-) particles which revolve around the nucleus in well-defined orbits.
- These are represented by e- .
- The mass of an electron is considered to be negligible and its charge is minus one.
- Electrons can be easily peeled off.
The discovery of Electrons was made by J. J. Tomson.
(iii) Neutron: Nutrons are elecrically no charge non-atomic particles which are present in nuceus of an atom. They have no any charge.
The discovery of nutrons :
In 1932, J. Chadwick discovered another subatomic particle which had no charge and a mass nearly equal to that of a proton. It was eventually named as neutron.
- Neutrons are present in the nucleus of all atoms, except hydrogen.
- In general, a neutron is represented as ‘n’.
- The mass of an atom is therefore given by the sum of the masses of protons and neutrons present in the nucleus.
Neutral Atom: Generally, all atoms are electrically neutral, because the number of positively charged particles protons are equal to negatively charged particles electrons in any atom. This is the cause to be an atom neutral and net charges on it is zero.
Example : Oxygen has 8 positively charge particles protons and 8 negatively charged particles electrons.
- J. J. Tomson is the first scientist who present the model of atom.
Canal Rays : Canal rays are stream of positively charged particles emitted from anode of immersion tube, when electric current is flown through gas at very low pressure.
Why Our NCERT Solutions Is Matters For Your Study?
NCERT Solutions are one of the most trusted study resources for students preparing for school exams and board examinations. These solutions help students understand every concept clearly and improve their academic performance. In today’s competitive education system, simply reading the textbook is not enough. Students need proper explanations and accurate answers to understand topics in depth. That is why NCERT Solutions for Classes 6 to 12 are considered essential for effective learning and exam preparation.
On this page, students can find latest NCERT Solutions prepared according to the current CBSE syllabus. These solutions are created by subject experts to help students understand every question in a simple and easy way. With the help of chapter-wise NCERT answers, students can quickly revise important topics and strengthen their concepts. Whether you are preparing for school tests, annual exams, or board exams, these NCERT textbook solutions will guide you step by step.
NCERT Solutions for Class 9 science Chapter 4. Structure of The Atom Topic Non-atomic particles
NCERT Solutions for Class 9 science Chapter 4. Structure of The Atom Topic Non-atomic particles are prepared to help students understand important concepts of the chapter in a simple and clear manner. These solutions are based on the latest CBSE syllabus and follow the official NCERT textbooks. Students who are searching for accurate answers and step-by-step explanations can use these solutions to improve their learning and prepare better for school exams as well as board examinations.
In this section you will find Class 9 science NCERT Solutions covering important questions, explanations and concept-based answers. Each question from the NCERT book is solved carefully so that students can understand how to write answers correctly in examinations. These solutions are also useful for quick revision before tests and assignments.
Why NCERT Solutions Are Important for Class 9 science
NCERT books are considered the most reliable study material for CBSE students. Most examination questions are directly based on NCERT textbooks. Therefore studying NCERT Solutions for Class 9 science helps students understand the exact pattern of questions and the correct method of answering them.
By practicing the questions from Chapter 4. Structure of The Atom, students can strengthen their conceptual knowledge and improve their analytical thinking skills. These solutions also help students identify the most important topics and prepare effectively for school examinations.
About Chapter 4. Structure of The Atom of Class 9 science
Chapter 4. Structure of The Atom is an important part of the Class 9 science syllabus. This chapter explains several key concepts which are essential for understanding the subject in detail. Students often face difficulties while solving textbook questions related to this chapter. That is why NCERT Solutions for Chapter 4. Structure of The Atom are provided to explain every concept in a simple and structured way.
The explanations provided here follow the official NCERT approach so that students can easily relate them to their textbook content. By studying these answers carefully, students can learn how to structure their answers and present them clearly in exams.
Understanding Topic: Non-atomic particles
The topic Non-atomic particles plays a significant role in Class 9 science Chapter 4. Structure of The Atom. Students must understand this topic clearly because it often appears in examinations in the form of short answer or long answer questions. The solutions provided here explain the topic in a step-by-step format so that students can easily grasp the concept.
By studying Non-atomic particles carefully, students can build a strong foundation in the subject and improve their overall academic performance. These solutions also help students revise the topic quickly before examinations.
Benefits of Using NCERT Solutions
- Concept clarity: Each answer explains the concept in simple language.
- Exam preparation: Solutions follow the CBSE exam pattern.
- Quick revision: Students can revise important questions quickly.
- Accurate answers: All solutions are based on the official NCERT textbook.
- Better understanding: Step-by-step explanations improve learning.
Students studying NCERT Solutions for Class 9 science Chapter 4. Structure of The Atom can easily understand the important points of the chapter. These solutions are also useful for completing homework assignments and preparing for tests.
Study NCERT Solutions in english
These solutions are available in english medium so that students can easily understand the concepts in their preferred language. Whether students are studying in Hindi medium or English medium, these solutions help them learn the subject more effectively and prepare confidently for examinations.
By practicing questions from Class 9 science Chapter 4. Structure of The Atom Topic Non-atomic particles, students can strengthen their conceptual understanding and improve their problem-solving skills.
Conclusion
In conclusion, NCERT Solutions for Class 9 science Chapter 4. Structure of The Atom Topic Non-atomic particles provide complete guidance for students who want to understand the chapter thoroughly. These solutions make learning easier, help students revise important concepts and improve their exam performance. Students should practice these answers regularly to build strong fundamentals and achieve better results in their examinations.
4. Structure of The Atom-Non-atomic particles Science Class 9 In English-CBSE Notes
Hindi Medium Students/Teachers/Tutors:
All Chapters science Class 9
Class Wise NCERT Solutions
Students can find NCERT Solutions for Class 6, Class 7, Class 8, Class 9, Class 10, Class 11, and Class 12 on this page. Each class includes detailed solutions for important subjects such as Science, Mathematics, Social Science, English, and Hindi. These solutions are carefully prepared to ensure accuracy and clarity.
- NCERT Solutions for Classes 6 to 8 – Ideal for building strong basic concepts.
- NCERT Solutions for Classes 9 and 10 – Helpful for board exam preparation.
- NCERT Solutions for Classes 11 and 12 – Important for advanced concepts and competitive exams.
4. Structure of The Atom-Non-atomic particles Science Class 9 In English-CBSE Notes Study Materials For Class 6 to 12
Benefits of Studying with NCERT Solutions
Using online NCERT Solutions makes learning easier and more convenient. Students can access the study material anytime and anywhere using their mobile phone, tablet, or computer. This flexibility helps students manage their study time more efficiently and prepare better for exams.
- Easy online access anytime and anywhere.
- Time-saving preparation with ready solutions.
- Better practice with accurate answers.
- Effective revision before exams.
Improve Your Learning with NCERT Solutions
Regular practice with NCERT textbook solutions helps students strengthen their understanding of each subject. These solutions not only help students complete their homework but also improve their analytical and problem-solving skills. By studying chapter-wise answers, students can learn the correct way to write answers in exams and score better marks.
If you want to improve your academic performance, start studying with free NCERT Solutions for all classes. These solutions are designed to make learning simple, clear, and effective for every student. Choose your class, explore the chapters, and begin your preparation with the latest NCERT Solutions today.