Class 9th Structure of the Atom

Description

Quiz Description: Structure of the Atom (Class 9 Science)

This quiz is designed to test your understanding of the chapter “Structure of the Atom” from the Class 9 Science syllabus (NCERT / CBSE). It covers the key concepts, discoveries, and models that explain the internal structure of an atom.

📘 Topics Covered:

1. Early atomic theories

   • Dalton’s Atomic Theory

   • Limitations of Dalton’s model

2. Discovery of Subatomic Particles

   • Electron (J.J. Thomson’s experiment)

   • Proton (E. Goldstein and Rutherford)

   • Neutron (James Chadwick)

3. Atomic Models

   • Thomson’s Model (“Plum Pudding” model)

   • Rutherford’s Nuclear Model (Alpha particle scattering experiment)

   • Bohr’s Model (quantized energy levels)

4. Atomic Structure

   • Atomic number, mass number

   • Isotopes and Isobars

   • Distribution of electrons in shells (2n² rule)

5. Modern Understanding of the Atom

   • Arrangement of electrons

   • Valency and stability of atoms

🎯 Quiz Objective:

To help students:

• Revise important concepts of atomic structure

• Strengthen their conceptual understanding through multiple-choice and short-answer questions

• Prepare effectively for exams

🕒 Format:

• Total Questions: 30

• Types: Multiple Choice

• Time Limit: 30 minutes