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Notes ⇒ Class 9th ⇒ Science ⇒ 4. Structure of The Atom

# Notes 4. Structure of The Atom - page 5 | Class 9 Science - Toppers Study

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## Notes 4. Structure of The Atom - page 5 | Class 9 Science - Toppers Study

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Chapter 4 Science class 9

### page 5 class 9 Science Chapter 4. Structure of The Atom

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## Notes 4. Structure of The Atom - page 5 | Class 9 Science - Toppers Study

Lesson - 4

Q1.  Maximum, how many electrons are held in N orbit of an atom?

Ans: 32 electrons.

Q2.  What is the source of Alpha particles of Rutherford experiment?

Ans:  Double charged Helium particle.

Q3.  Name the non-atomic particle which does not take part in atomic mass.

Ans: Electrons.

Q4.  Name the positive charged atomic particles which presence in nucleus.

Ans: Protons.

Q5.  Copper has atomic number 29. Then what is its valency?

Ans: 1

Q6. Give the example of isobar?

Ans: Calcium, Argon

Q7.  Name the scientist who proposed that the atom is as chrismas cake.

Ans: J. Thomson.

Q8.  Name the scientist who discovered protons.

Ans: E Gold Steen.

Q9.

Q10. Name the isotope of hydrogen which has 2 atomic mass number.

Ans: Deuterium

Q11.  Name the non-atomic particle which takes part in atomic mass and having no charge.

Ans: Neutron

Q12. Name the isotope of element which is used in treatment of goiter. – Iodine

Q13.  Name the scientist who discovered the nucleus.

Ans: Rutherford

Q14.

Q15. Name the scientist who discovered the neutron.

Q16. Name the isotopes of element which is used in atomic reacter as fuel.

Ans:  Uranium

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## Study Materials List:

##### Notes ⇒ Class 9th ⇒ Science
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

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