🧪 CBSE Class 9 Science Chapter 4: STRUCTURE OF THE ATOM – English & Hindi Full Notes, MCQs & FAQs

🧪 CBSE Class 9 Science Chapter 4: STRUCTURE OF THE ATOM – English & Hindi Full Notes, MCQs & FAQs
By Grandmaster Bikram Sutradhar | SirBikramSutradhar | BASTRONAUTWAY
📘 Chapter Introduction – English
Welcome to the ultimate guide on CBSE Class 9 Science Chapter 4: Structure of the Atom, brought to you by Grandmaster Bikram Sutradhar (SirBikramSutradhar) under the BASTRONAUTWAY initiative. This chapter explains the evolution of atomic theory, discoveries of subatomic particles, atomic models by Thomson, Rutherford, and Bohr, and concepts like atomic number, mass number, isotopes, and isobars. This guide includes 100% exam-focused notes, solved intext & exercise questions, MCQs, and FAQs – all in a bilingual (English + Hindi) format.
📘 अध्याय की प्रस्तावना – हिंदी
CBSE कक्षा 9 विज्ञान अध्याय 4: परमाणु की संरचना का यह मार्गदर्शक नोट्स, MCQs, और FAQs के साथ Grandmaster Bikram Sutradhar (SirBikramSutradhar) द्वारा BASTRONAUTWAY के अंतर्गत तैयार किया गया है। यह अध्याय परमाणु सिद्धांतों के विकास, उपपरमाण्विक कणों की खोज, थॉमसन, रदरफोर्ड और बोहर के परमाणु मॉडल, तथा परमाणु संख्या, द्रव्यमान संख्या, समस्थानिक और समभारिक जैसे विषयों को सरल भाषा में समझाता है। यह गाइड बाइलिंगुअल (अंग्रेजी + हिंदी) में परीक्षा-केंद्रित जानकारी प्रदान करता है।
✅ Key Topics Covered / मुख्य विषय
📌 English:
- Dalton’s Atomic Theory
- Discovery of Electrons, Protons, Neutrons
- Thomson’s Model of Atom
- Rutherford’s Alpha Scattering Experiment
- Bohr’s Model of Atom
- Atomic Number & Mass Number
- Isotopes and Isobars
- Electronic Configuration
- Valency and Octet Rule
📌 हिंदी:
- डाल्टन का परमाणु सिद्धांत
- इलेक्ट्रॉन, प्रोटॉन और न्यूट्रॉन की खोज
- थॉमसन का परमाणु मॉडल
- रदरफोर्ड का अल्फा-कण प्रकीर्णन प्रयोग
- बोहर का परमाणु मॉडल
- परमाणु संख्या और द्रव्यमान संख्या
- समस्थानिक एवं समभारिक
- इलेक्ट्रॉनिक विन्यास
- संयोजकता और ऑक्टेट नियम
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Q: proposed the nuclear model
(a) Bohr (x)
(b) Thomson (x)
(c) Rutherford (✔)
(d) Dalton (x)
👉 Answer: Rutherford (✔)
💬 Explanation: Rutherford’s gold foil experiment led to the discovery of the nucleus.
किसने परमाणु का नाभिकीय मॉडल प्रस्तावित किया था?
👉 उत्तर: रदरफोर्ड (✔)
❓ Top 10 FAQs – Structure of the Atom | FAQ हिंदी + English
Q1. What are isotopes? | समस्थानिक क्या होते हैं?
👉
👉 समस्थानिक वे परमाणु होते हैं जिनकी परमाणु संख्या समान होती है परंतु द्रव्यमान संख्या अलग होती है।
Q2. What is the charge of an electron? | इलेक्ट्रॉन का आवेश क्या होता है?
👉 Negative (-1)
👉 ऋणात्मक (-1)
Q3. What is the significance of the neutron? | न्यूट्रॉन का महत्व क्या है?
👉 It adds mass to the atom but does not affect charge.
👉 यह परमाणु के द्रव्यमान में वृद्धि करता है लेकिन आवेश को प्रभावित नहीं करता।
📌 Why BASTRONAUTWAY by Grandmaster Bikram Sutradhar?
- 🧠 Concept Simplification: Tough concepts made easy
- ✍️ Exam-Centric Solutions: Focus on scoring more
- 🌐 Bilingual Content: Understand better in both Hindi & English
- 🎯 100% Unique & Verified: No errors, just clarity
🔗 Stay Tuned!
More chapters, interactive PDFs, and mock tests coming soon on BASTRONAUTWAY – Powered by Grandmaster Bikram Sutradhar (SirBikramSutradhar).
Written By
Full Stack Developer and 5-Time World Record Holder, Grandmaster Bikram Sutradhar
bAstronautWay
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CBSE Class 10 Mathematics (2025) NCERT Syllabus:
CBSE Class 10 Mathematics NCERT Syllabus (2025) – Chapter-Wise List
CBSE Class 10 Mathematics NCERT Syllabus (2025) – Chapter-Wise List
chapter 4. Quadratic Equations
chapter 5. Arithmetic Progressions
chapter 6. Triangles
chapter 7. Coordinate Geometry
chapter 8. Introduction to Trigonometry
chapter 9. Some Applications of Trigonometry
chapter 11. Areas Related to Circles
chapter 12. Surface Areas and Volumes
class 10 science ncert solution
CBSE Class 10 Science (2025) NCERT Syllabus:
CBSE Class 10 Science NCERT Syllabus (2025) – Chapter-Wise List
CBSE Class 10 Science NCERT Syllabus (2025) – Chapter-Wise List
Chapter 1 Chemical Reactions and Equations
Chapter 2 Acids, Bases and Salts
Chapter 3 Metals and Non-metals
Chapter 4 Carbon and its Compounds
Chapter 5 Life Processes
Chapter 6 Control and Coordination
Chapter 7 How do Organisms Reproduce?
Chapter 8 Heredity
Chapter 9 Light – Reflection and Refraction
Chapter 10 The Human Eye and the Colourful World
Chapter 11 Electricity
Chapter 12 Magnetic Effects of Electric Current
Chapter 13 Our Environment
📖 Chapter 12 – Organic Chemistry (Selina Textbook)
Table of Contents:
Glossary
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