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Atomic Structure and Chemical Bonding — Revision Notes

ICSE · Class 9 · Chemistry

Atomic Structure and Chemical Bonding revision notes for ICSE Class 9 Chemistry: 4 topics in quick points. Part of the ICSE Class 9 Chemistry syllabus.

42 questions44 flashcards4 formulas & key relations5 concepts

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A labeled diagram illustrating J.J. Thomson's cathode ray tube experiment, showing the generation of cathode rays, their deflection by electric and magnetic fields, and how this led to the discovery o
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Key Topics to Revise

1

1. Early ideas and discovery of subatomic particles

  • Maharshi Kanada first proposed that matter consists of indestructible minute particles called paramanus.
  • Democritus called the paramanu an atom, meaning indivisible.
  • John Dalton gave the first scientific theory about matter in 1808.
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2. Structure of the atom

  • An atom has two main parts: nucleus and extra-nuclear space.
  • The nucleus is the central part and contains protons and neutrons.
  • Electrons revolve around the nucleus in orbits or shells.
3

3. Fundamental particles of the atom

  • Electron is a negatively charged fundamental particle found outside the nucleus.
  • Proton is a positively charged fundamental particle found in the nucleus.
  • Neutron is a neutral fundamental particle found in the nucleus.
4

4. Atomic models and discovery of nucleus

  • Thomson's plum pudding model described the atom as a sphere of uniform positive charge with electrons embedded in it.
  • Rutherford conducted the alpha-particle scattering experiment using gold foil.
  • Most alpha particles passed straight through, showing that an atom has a lot of empty space.

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Full Notes

Key Concepts

An element is made upAtoms contain electronsAtomic number equals the numberElectrons are arranged in shellsValence electrons are the electrons

Frequently Asked Questions

What are the important topics in Atomic Structure and Chemical Bonding for ICSE Class 9 Chemistry?
Key topics in Atomic Structure and Chemical Bonding include Early ideas and discovery of subatomic particles, Structure of the atom, Fundamental particles of the atom, Atomic models and discovery of nucleus. Study these first, then practise questions on each for Class 9 exams.
How should I revise Atomic Structure and Chemical Bonding for Class 9 exams?
Learn the core ideas first, then work through the 42 practice questions on Atomic Structure and Chemical Bonding. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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All ICSE Class 9 Chemistry Revision Notes

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