CBSE - Class 9th - Science - Ch 4 - Structure of the Atom - Question Bank

Hey Friends, Hope you liked my previous post of Question Bank of Chapter 3 - Atoms and Molecules. In this post, I would like to share the questions from Chapter 4 - Structure of the Atom, to help you revise the concepts of this chapter to prepare well for exam.

CBSE - NCERT - Class 9th - Science

Chapter 4 - Structure of the Atom

• On rubbing two objects together, why does it get electrically charged?

• What are Canal rays?

• What is the mass of 1 proton and 1 electron?

• Explain Thomson’s model of an atom with Diagram.

• Explain the setup of Rutherford’s experiment involving Scattering of alpha (α) particles by a Gold Foil. 

• What were the observations made during the Rutherford's experiment of alpha particle scattering? Also Give the conclusions given by Rutherford for each of the observations.

• On the basis of Rutherford’s alpha (α) particles scattering experiment, what were the features of the Nuclear model of an atom as proposed by Rutherford?

• What were the drawbacks of Rutherford’s Model of Atom?

• What are the postulates put forward by Neils Bohr about the model of an Atom?

• Neutrons are present in the nucleus of all atoms, except one Element. Which one is that?

• What are the 3 rules followed for writing the number of electrons in different orbit or shells as suggested by Bohr and Bury?

• Draw the atomic structure showing orbit and electron distribution for
• Neon
• Sodium
• Argon

• What is the Valency of following elements
• Helium
• Neon
• Carbon
• Phosphorus
• Boron
• Aluminium
• Magnesium
• Fluorine

• Why is the Valency of Fluorine 1 instead of 7?

• Define Atomic Number.

• How is the Mass Number of Atom determined?

• Give the notation for representing an atom using atomic number, mass number and atomic symbol. Give an Example.

• Define Isotopes with an example.

• Derive the atomic mass of Chlorine containing 2 isotope of 35u and 37u in the ratio of 3:1.

• Give some examples of practical application of Isotopes in various fields.

• Define Isobars with examples.

• Who discovered Electron?

• Who discovered Proton?

Hope the above questions would help you prepare well for exams. If you are looking for answers to the above questions as well, do comment below and let me know your thoughts.