CBSE NCERT Solutions for Class 9 Science Chapter 4

Free Download CBSE NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom Page 43 or Page 49 or Page 50 or Page 52 or Page 53 and Exercises in English Medium or  पेज 53 के उत्तर or पेज 56 के उत्तर or पेज 57 के उत्तर or पेज 58 के उत्तर or पेज 59 के उत्तर or पेज 60 के उत्तर and  अभ्यास के प्रश्न उत्तर  to study online or in PDF form. NCERT Solutions for all other subjects based on latest CBSE Syllabus are also available to download.


CBSE NCERT Solutions for Class 9 Science Chapter 4

CBSE NCERT Solutions for Class 9 Science Chapter 4

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Page 43 Answers

NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom Intext Questions on Page 43 are given below. Click here for Page 49 or Page 50 or Page 52 or Page 53 and Exercises in English or go for Hindi Medium Solutions. Go back to Class 9 Science main page or move to Top of page.

NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom intext questions page 43



Page 49 Answers

NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom Intext Questions on Page 49 are given below. Click here for Page 43 or Page 50 or Page 52 or Page 53 and Exercises in English or go for Hindi Medium Solutions. Go back to Class 9 Science main page or move to Top of page.

NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom intext questions page 49
NCERT Solutions for Class 9 Science Chapter 4 intext questions page 49




NCERT Solutions for Class 9 Science Chapter 4 intext questions page 49 in pdf form

Page 50 Answers

NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom Intext Questions on Page 50 are given below. Click here for Page 43 or Page 49 or Page 52 or Page 53 and Exercises in English or go for Hindi Medium Solutions. Go back to Class 9 Science main page or move to Top of page.

NCERT Solutions for Class 9 Science Chapter 4 intext questions page 50

Page 52 Answers

NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom Intext Questions on Page 52 are given below. Click here for Page 43 or Page 49 or Page 50 or Page 53 and Exercises in English or go for Hindi Medium Solutions. Go back to Class 9 Science main page or move to Top of page.

NCERT Solutions for Class 9 Science Chapter 4 intext questions page 52



NCERT Solutions for Class 9 Science Chapter 4 intext questions page 52 in pdf form

Page 53 Answers

NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom Intext Questions on Page 53 are given below. Click here for Page 43 or Page 49 or Page 50 or Page 52 and Exercises in English or go for Hindi Medium Solutions. Go back to Class 9 Science main page or move to Top of page.

NCERT Solutions for Class 9 Science Chapter 4 intext questions page 53

Exercises Questions Answers

NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom Exercises Solutions are given below. Click here for Page 43 or Page 49 or Page 50 or Page 52 or Page 53 or go for Hindi Medium Solutions. Go back to Class 9 Science main page or move to Top of page.

9 Science Chapter 4 Structure of the Atom Exercises Solutions



9 Science Chapter 4 Structure of the Atom Exercises Solutions all question answers
9 Science Chapter 4 Structure of the Atom Exercises Solutions in pdf form
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9 Science Chapter 4 Structure of the Atom Exercises Solutions in english medium



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9 Science Chapter 4 Structure of the Atom Exercises Solutions atoms

पेज 53 के उत्तर




NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom Intext Questions पेज 53 के उत्तर नीचे दिए गए हैं. Click here for पेज 56 के उत्तर or पेज 57 के उत्तर or पेज 58 के उत्तर or पेज 59 के उत्तर or पेज 60 के उत्तर or अभ्यास के प्रश्न उत्तर  or go for English Medium Solutions. Go back to Class 9 Science main page or move to Top of page.

9 Science page 53 intext question answers

पेज 56 के उत्तर





NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom Intext Questions पेज 56 के उत्तर नीचे दिए गए हैं. Click here for  पेज 53 के उत्तर or पेज 57 के उत्तर or पेज 58 के उत्तर or पेज 59 के उत्तर or पेज 60 के उत्तर or अभ्यास के प्रश्न उत्तर  or go for English Medium Solutions. Go back to Class 9 Science main page or move to Top of page.

9 Science page 56 intext question answers
9 Science page 53 intext question answers in hindi

पेज 57 के उत्तर




NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom Intext Questions पेज 57 के उत्तर नीचे दिए गए हैं. Click here for  पेज 53 के उत्तर or पेज 56 के उत्तर or पेज 58 के उत्तर or पेज 59 के उत्तर or पेज 60 के उत्तर or अभ्यास के प्रश्न उत्तर  or go for English Medium Solutions. Go back to Class 9 Science main page or move to Top of page.

9 Science page 57 intext question answers

पेज 58 के उत्तर




NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom Intext Questions पेज 58 के उत्तर नीचे दिए गए हैं. Click here for  पेज 53 के उत्तर or पेज 56 के उत्तर or पेज 57 के उत्तर or पेज 59 के उत्तर or पेज 60 के उत्तर or अभ्यास के प्रश्न उत्तर  or go for English Medium Solutions. Go back to Class 9 Science main page or move to Top of page.

9 Science page 58 intext question answers

पेज 59 के उत्तर





NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom Intext Questions पेज 59 के उत्तर नीचे दिए गए हैं. Click here for  पेज 53 के उत्तर or पेज 56 के उत्तर or पेज 57 के उत्तर or पेज 58 के उत्तर or पेज 60 के उत्तर or अभ्यास के प्रश्न उत्तर  or go for English Medium Solutions. Go back to Class 9 Science main page or move to Top of page.

9 Science page 59 intext question answers

पेज 60 के उत्तर




NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom Intext Questions पेज 60 के उत्तर नीचे दिए गए हैं. Click here for  पेज 53 के उत्तर or पेज 56 के उत्तर or पेज 57 के उत्तर or पेज 58 के उत्तर or पेज 59 के उत्तर or अभ्यास के प्रश्न उत्तर  or go for English Medium Solutions. Go back to Class 9 Science main page or move to Top of page.

9 Science page 60 intext question answers

अभ्यास के प्रश्न उत्तर




NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom अभ्यास के प्रश्न उत्तर नीचे दिए गए हैं. Click here for  पेज 53 के उत्तर or पेज 56 के उत्तर or पेज 57 के उत्तर or पेज 58 के उत्तर or पेज 59 के उत्तर or पेज 60 के उत्तर or go for English Medium Solutions. Go back to Class 9 Science main page or move to Top of page.

9 Science Chapter 4 Exercises
9 Science Chapter 4 Exercises solutions
9 Science Chapter 4 Exercises sols in hindi medium




9 Science Chapter 4 Exercises guide
9 Science Chapter 4 Exercises in pdf form free
9 Science Chapter 4 Exercises all question answers
9 Science Chapter 4 Exercises free guide in hindi


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Class 9 Science – Chemistry – Structure of the Atom

Extra Questions for Exam preparation

Question 1:
Is atomic number of an atom always equal to the number of electrons?
Answer 1:
No, it is the case when the atom has no charge. In case of cation (positively charged), atomic number is more than the number of electrons and in case of anion (negatively charged), it is less than the number of electrons.

Question 2:
Nucleus of an atom has positive charge on it. Establish.
Answer 2:
This can be established on the basis of Rutherford scattering experiment. Since some alpha particles were repelled by the nucleus of the atom, it is expected to have the same charge as on alpha particles. Therefore, nucleus of an atom has positive charge.

Question 3:
Were neutrons known at the time Rutherford performed the scattering experiment?
Answer 3:
No, these were discovered later on by Chadwick in 1931 whereas scattering experiment was performed by Rutherford in 1911.

Question 4:
Why are isotopes of an element chemically similar?
Answer 4:
Isotopes of an elements have same number of electrons and therefore, same value shell electronic distribution. Since the chemical properties of the atoms are related to valence shell configurations, the isotopes are chemically similar.

More Questions for Practice

Question 1:
Why do elements which exist as isotopes have fractional atomic masses?
Answer 1:
the different isotopes of an element differ in their mass number as well as atomic masses. In order to represent the atomic mass of the element, we have to consider average of the atomic masses of the different isotopes and also the ratio in which these are present. In most of the cases, the average comes out to be in fraction. Therefore, these elements have fractional atomic masses.

Question 2:
Why is a proton not a universal particle like electron?
Answer 2:
A proton is the positively charged residue left when hydrogen gas is enclosed in the in the discharge tube. For the other gases, the positive residues formed contain different number of protons. Therefore, proton is not a universal particle like electron.

Question 3:
An electron is regarded as a universal particle. Explain.
Answer 3:
The value of charge (e) and mass (m) of the electron always remain the same whatever may be the source of their emission. In the discharge tube, the electrons may be emitted either from the cathode or form the gas enclosed in the discharge tube. Whatever may be the metal which forms the cathode or the gas present in the discharge tube, these values remain the same. Therefore, electron is regarded as a universal particle.
Question 4:
Why do the element helium, neon and argon have zero valency?
Answer 4:
Helium has two electrons in its only energy shell (K-shell). The other two elements have eight electrons in their valence shells. Since these are the maximum number of electrons which the atoms of these elements can have therefore, they do not have any urge or desire to take part in chemical combination. These elements are known as zero valent elements. They have therefore, valency equal to zero.