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Structure of Atom

ICSE · Class 11 · Chemistry

Quick revision notes for Structure of Atom — ICSE Class 11 Chemistry. Key concepts, formulas, and definitions for last-minute revision.

89 questions56 flashcards5 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. Fundamental Particles and Early Atomic Ideas

  • Matter is made of extremely small atoms.
  • Atoms of the same element are alike and differ from atoms of other elements.
  • The three fundamental subatomic particles are electron, proton, and neutron.
2

2. Atomic Number, Mass Number, Isotopes and Isobars

  • Atomic number is the number of unit positive charges on the nucleus.
  • For a neutral atom, atomic number equals number of protons and electrons.
  • Mass number is the sum of protons and neutrons in the nucleus.
3

3. Nature of Light and Electromagnetic Radiation

  • Wave theory explains reflection, refraction, interference and diffraction.
  • Wave theory cannot explain black body radiation and photoelectric effect.
  • Planck proposed that radiant energy is emitted or absorbed as quanta or photons.
4

4. Planck's Theory and Photoelectric Effect

  • Energy is emitted or absorbed in discrete packets.
  • Photoelectric effect is the emission of electrons from a metal surface when light falls on it.
  • Threshold frequency is the minimum frequency needed to eject electrons.

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Full Notes

Key Concepts

Matter was first viewed as beingAn electron is a negatively chargedA proton is a positively chargedA neutron is electrically neutralRutherford’s alpha

Frequently Asked Questions

What are the important topics in Structure of Atom for ICSE Class 11 Chemistry?
Key topics in Structure of Atom include Structure of Atom - Complete Concept Overview, Structure of Atom – Complete Chapter Overview, Flowchart showing the discharge tube experiment process and how cathode rays were identified as electrons. These are the concepts ICSE Class 11 examiners draw on most — study them first, then practise related questions.
How to score full marks in Structure of Atom — ICSE Class 11 Chemistry?
Understand the core concepts first, then work through the 89 practice questions available for this chapter. Revise formulas and 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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