Class 9 4. Structure of The Atom Additional -Questions 2: NCERT Book Solutions
Class 9 chapter 4. Structure of The Atom important extra long questions with solution for board exams and term 1 and term 2 exams.
NCERT Solutions
All chapters of ncert books Science 4. Structure of The Atom Additional -Questions 2 is solved by exercise and chapterwise for class 9 with questions answers also with chapter review sections which helps the students who preparing for UPSC and other competitive exams and entrance exams.
Class 9 chapter 4. Structure of The Atom important extra long questions with solution for board exams and term 1 and term 2 exams. - 4. Structure of The Atom - Additional -Questions 2: NCERT Book Solutions for class 9th. All solutions and extra or additional solved questions for 4. Structure of The Atom : Additional -Questions 2 Science class 9th:English Medium NCERT Book Solutions. Class 9 chapter 4. Structure of The Atom important extra long questions with solution for board exams and term 1 and term 2 exams.
4. Structure of The Atom : Additional -Questions 2 Science class 9th:English Medium NCERT Book Solutions
Class 9 chapter 4. Structure of The Atom important extra long questions with solution for board exams and term 1 and term 2 exams. - 4. Structure of The Atom - Additional -Questions 2: NCERT Book Solutions for class 9th. All solutions and extra or additional solved questions for 4. Structure of The Atom : Additional -Questions 2 Science class 9th:English Medium NCERT Book Solutions.
Class 9 4. Structure of The Atom Additional -Questions 2: NCERT Book Solutions
NCERT Books Subjects for class 9th Hindi Medium
4. Structure of The Atom
Class 9 chapter 4. Structure of The Atom important extra long questions with solution for board exams and term 1 and term 2 exams.
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.
Class 9 chapter 4. Structure of The Atom important extra long questions with solution for board exams and term 1 and term 2 exams.
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Class 9 chapter 4. Structure of The Atom important extra long questions with solution for board exams and term 1 and term 2 exams. - 4. Structure of The Atom - Additional -Questions 2: NCERT Book Solutions for class 9th. All solutions and extra or additional solved questions for 4. Structure of The Atom : Additional -Questions 2 Science class 9th:English Medium NCERT Book Solutions. Class 9 chapter 4. Structure of The Atom important extra long questions with solution for board exams and term 1 and term 2 exams.
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Notes And NCERT Solutions
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Science Chapter List
1. Matter in Our Surroundings
2. Is Matter around us Pure
3. Atoms and Molecules
4. Structure of The Atom
5. The Fundamental Unit of Life
6. Tissues
7. Diversity in Living Organisms
8. Motion
9. Force and Laws of Motion
10. Gravitation
11. Work and Energy
12. Sound
13. Why Do We Fall ill
14. Natural Resources
15. Improvement in Food Resources
