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Ncert Solution | Ncert Solution for class 9th | NCERT solutions for Class 9 Science | NCERT SOLUTIONS FOR CLASS 9 SCIENCE CHAPTER 4 STRUCTURE OF ATOM
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NCERT Solutions for Class 9 Science Chapter 4 Structure of Atom

NCERT Solutions for Class 9 Science Chapter 4 Structure of Atom are prepared by CBSE student eCARE expert to score good marks in class 9. This chapter contain many topics which are very important to score good in class 9. There are some important topic/Activity mentioned below- 

Topics and Sub Topics in Class 9 Science Chapter 4 Structure of Atom:

  1. Structure of Atom
  2. Charged Particles in Matter
  3. The Structure of an Atom
  4. How are Electrons Distributed in Different Orbits (Shells)?
  5. Valency
  6. Atomic Number and Mass Number

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Some questions are asked by class 9 students related to Science

1. What are the canal rays?


The radiations that are positively charged are canal rays. This discovery was crucial in the discovery

of another subatomic particle that was positively charged – proton.

2. If an atom contains one electron and one proton, will it carry any charge or not?


Since a proton is a positively charged particle and an electron is a negatively charged particle, the net

charge becomes neutral as both the particles neutralizes each other.

1. On the basis of Thompson’s model of an atom, explain how the atom is neutral as a whole.


As per Thompson’s model of an atom,

(i) An atom contains a positively charged sphere in which the negatively charged electrons are implanted.

(ii) Electrons and protons are equal in magnitude, hence an atom on the whole is electrically neutral.

2. On the basis of Rutherford’s model of an atom, which subatomic particle is present in the nucleus of an atom?


As per Rutherford’s model of an atom, the positively charged protons are the ones that are present in the atom.