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4. Structure of The Atom Class 9 science Solutions English Medium-Additional -Questions 2
4. Structure of The Atom Class 9 science Solutions English Medium-Additional -Questions 2 Get chapter-wise detailed explanations, step-by-step answers, important questions and exam-ready study material in Hindi and English medium.
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4. Structure of The Atom Class 9 science Solutions English Medium-Additional -Questions 2
NCERT Solutions for Class 9 are specially prepared according to the latest CBSE syllabus (2026-27) to help students understand every concept clearly. These solutions provide step-by-step explanations, accurate answers, and exam-oriented guidance for all chapters. Class 9 students can improve their problem-solving skills, strengthen conceptual understanding, and prepare confidently for school as well as board examinations. All questions are solved in a simple and easy-to-understand language for both Hindi and English medium learners.
4. Structure of The Atom Class 9 science Solutions English Medium-Additional -Questions 2
NCERT Solutions Class 9 science English Medium
4. Structure of The Atom
Topic: Additional -Questions 2
Additional And Important Questions With solutions:
Q – Write the results of Rutherford’s particle scattering experiment.
A – The following observations were made: Most of the fast moving particles passed straight through the gold foil.
- Some of the α-particles were deflected by the foil by small angles.
- Surprisingly one out of every 12000 particles appeared to rebound.
5. Compare all the proposed models of an atom given in this
chapter.
6. Summarise the rules for writing of distribution of electrons in various shells for the first eighteen elements.
Q – Describe Thomson’s model of the atom.
A – Thomson proposed that:
- An atom consists of a positively charged sphere and the electrons are embedded in it.
- The negative and positive charges are equal in magnitude. So, the atom as a whole is electrically neutral.
Q – Define valency by taking examples of silicon and oxygen.
A – The electrons present in the outermost shell of an atom are known as the valence electrons. This number of valence electrons is called valency.
Example of silicon and oxygen
Number of electrons in silicon = 14
Electronic configuration = 2, 8, 4
The number of valence electrons = 4
Hence valency = 4
Example of oxygen
Number of electrons in oxygen = 8
Electronic configuration = 2, 6
The number of valence electrons = 8 – 6 = 2
Hence valency = 2
Q – Define atomic number.
A – The number of protons presence in nucleus of an atom is known as atomic number.
Q – Define atomic mass.
A – The sum of number of protons and neutrons presence in nucleus of an atom is known as atomic mass.
Q – Define isotopes.
A – The atoms of an element are called isotopes of that element which has equal atomic number but different atomic mass.
Q – Define isobar.
A – The atoms of an element are called isobar of that element which
Q – Differentiate between isotopes and isobars.
A -
|
isotopes |
isobars |
( )
|
|
Q – Write three applications of isotopes.
A – Three applications of isotopes.
- An isotope of uranium is used as a fuel in nuclear reactors.
- An isotope of cobalt is used in the treatment of cancer.
- An isotope of iodine is used in the treatment of goitre.
All Topics From 4. Structure of The Atom
See other sub-topics of this chapter:
1. Chapter Review 2. Text-book Questions 3. Additional -Questions 4. Additional -Questions 2 5. Additional -Questions 3NCERT Solutions Class 9 Hindi and English Medium – Complete Study Material
NCERT Solutions Class 9 students ke liye specially CBSE latest syllabus (2026-27) ke according prepare kiye gaye hain. Yeh solutions Hindi aur English medium dono ke liye available hain, jisse har student apni language preference ke hisaab se padh sakta hai. Har chapter ke sabhi prashnon ke step-by-step answers diye gaye hain jo concept clarity aur exam preparation me madad karte hain.
Chapter-Wise Detailed Explanations
Class 9 ke liye diye gaye Chapter Wise NCERT Solutions me har question ka detailed aur easy explanation diya gaya hai. Chahe aap CBSE Board Exam Preparation kar rahe ho ya school test ke liye revise kar rahe ho, yeh solutions aapko complete understanding denge. Har answer simple language me likha gaya hai jisse students concepts ko easily grasp kar saken.
Hindi and English Medium Support
Students Hindi aur English medium dono me NCERT Book Solutions Class 9 access kar sakte hain. Yeh dual language support un students ke liye helpful hai jo apni regional language me better samajhna chahte hain. Sabhi answers CBSE Latest Syllabus 2026-27 ke anusaar update kiye gaye hain.
Important Features of NCERT Solutions
- Class 9 NCERT Solutions PDF
- CBSE Class 9 Study Material
- NCERT Book Questions and Answers
- Exam Oriented Important Questions
- Step-by-Step Detailed Solutions
- Concept Clarity and Revision Notes
Why Students Should Use NCERT Solutions?
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Best Resource for Exam Preparation
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Isliye agar aap NCERT Solutions Class 9 Hindi and English Medium search kar rahe hain, to yahan aapko complete chapter-wise solutions milenge jo aapki academic journey ko strong aur confident banayenge.