Chapter 2 of 9

Updated 6 August 2026

Concept Maps

Structure of Atom — Concept Maps

ICSE · Class 11 · Chemistry

4 concept maps of Structure of Atom for ICSE Class 11 Chemistry, each also written out as a text outline. Part of the ICSE Class 11 Chemistry syllabus.

89 questions56 flashcards8 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 — Learn better with visuals Super Tutor pairs illustrations like this with notes and quizzes for Structure of Atom.

4 Concept Maps

Structure of Atom - Complete Concept Overview

The map in words

STRUCTURE OF ATOM
- Fundamental Particles
  - Electron
    - Negative charge
    - 9.108 × 10⁻³¹ kg
    - e/m = 1.759 × 10⁸ C/g
  - Proton
    - Positive charge
    - 1.672 × 10⁻²⁴ g
    - Mass 1837× electron
  - Neutron
    - No charge
    - 1.675 × 10⁻²⁴ g
    - Slightly heavier than proton
- Atomic Models
  - Thomson Model
    - Plum-pudding
    - Electrons embedded
    - Disproved by Rutherford
  - Rutherford Model
    - Nuclear nucleus
    - Electrons orbit
    - Explains alpha scattering
  - Bohr Model
    - Quantized orbits
    - Explains H spectrum
    - Limited to single electron
  - Quantum Mechanical
    - Schrödinger equation
    - Wave functions
    - Orbitals not orbits
- Electromagnetic Radiation
  - Properties
    - Wavelength λ
    - Frequency ν
    - c = λν
  - Energy
    - E = hν
    - Photons discrete
    - Planck constant
  - Spectrum
    - Visible light
    - VIBGYOR range
    - Atomic spectra discrete
- Atomic Spectra
  - Hydrogen Series
    - Lyman UV
    - Balmer visible
    - Paschen IR
    - Brackett IR
    - Pfund IR
  - Rydberg Formula
    - ν̄ = R(1/n₁² - 1/n₂²)
    - Predicts wavelengths
    - Works for H and H-like
- Wave-Particle Duality
  - de-Broglie Wavelength
    - λ = h/mv
    - Electrons ~3.32 Å
    - Measurable for microscopic
  - Uncertainty Principle
    - Cannot know x and p both
    - ΔxΔp ≥ h/4π
    - Eliminates Bohr orbits
- Quantum Numbers
  - Principal n
    - 1,2,3,4,5,6,7
    - Determines energy
    - Determines shell
  - Azimuthal l
    - 0 to n-1
    - s,p,d,f subshells
    - Determines shape
  - Magnetic m
    - -l to +l
    - Spatial orientation
    - Explains Zeeman effect
  - Spin s
    - +1/2 or -1/2
    - Two per orbital maximum
- Orbitals
  - s-orbitals
    - Spherical shape
    - 1 orbital per s subshell
    - 2 electrons max
  - p-orbitals
    - Dumbbell shaped
    - 3 orientations p_x p_y p_z
    - 6 electrons max
  - d-orbitals
    - Complex shapes
    - 5 orientations
    - 10 electrons max
  - f-orbitals
    - Very complex
    - 7 orientations
    - 14 electrons max
- Electronic Configuration
  - Aufbau Principle
    - Fill lowest energy first
    - 1s 2s 2p 3s 3p 4s 3d 4p...
  - Hund's Rule
    - Unpaired electrons parallel
    - Pairing only when full
  - Pauli Principle
    - No identical (n,l,m,s)
    - Max 2 per orbital opposite
  - Half-filled Stability
    - d⁵ extra stable
    - d¹⁰ extra stable
    - Explains Cr Cu exceptions

Structure of Atom – Complete Chapter Overview

The map in words

Structure of Atom
- Subatomic Particles
  - Electron
    - Cathode Rays
    - e/m = 1.759E8 C/g
    - Charge = 1.6E-19 C
    - Mass = 9.1E-31 kg
  - Proton
    - Canal Rays
    - e/m varies with gas
    - Mass = 1.672E-24 g
  - Neutron
    - Chadwick 1932
    - Be + He to C + n
    - Mass = 1.675E-24 g
- Atomic Models
  - Thomson Model
    - Plum Pudding
    - Electrons embedded
    - Failed Rutherford test
  - Rutherford Model
    - Gold Foil Experiment
    - Nuclear Model
    - Failed stability test
  - Bohr Model
    - Fixed Circular Orbits
    - H and H-like only
    - Quantized Energy
  - Quantum Mechanical Model
    - Schrodinger Equation
    - Orbitals not Orbits
    - Probability Picture
- Atomic Properties
  - Atomic Number Z
    - Protons in nucleus
    - Moseley X-ray method
  - Mass Number A
    - Protons plus Neutrons
  - Isotopes
    - Same Z different A
    - Same chemical properties
  - Isobars
    - Same A different Z
    - Different elements
- Electromagnetic Radiation
  - Wave Properties
    - Wavelength lambda
    - Frequency nu
    - c = nu x lambda
  - Planck Quantum Theory
    - E = h nu
    - Discrete quanta
  - Photoelectric Effect
    - Threshold Frequency
    - Work Function
    - Einstein Equation
- Quantum Numbers
  - Principal n
    - Shell size energy
    - 1 2 3 4
  - Azimuthal l
    - Subshell shape
    - 0 1 2 3 = s p d f
  - Magnetic m
    - Orientation
    - -l to +l
  - Spin s
    - Plus half minus half
- Electron Filling Rules
  - Pauli Exclusion
    - Max 2 per orbital
    - Opposite spins
  - Hund Rule
    - Maximize unpaired
    - Same spin direction
  - Aufbau Principle
    - Increasing energy order
    - 4s before 3d

Flowchart showing the discharge tube experiment process and how cathode rays were identified as electrons

The map in words

Discharge Tube Setup
- High Voltage Applied
  - Very Low Pressure
    - Cathode Rays Emitted
      - Properties of Rays
        Travel Path: Straight Lines
        Particles Identified
        Electrons Discovered
        Charge: Negative
        Energy: Kinetic Energy
        Deflection: Toward Positive

Structure of Atom

The map in words

Structure of Atom
- Atomic nature of matter
- Fundamental subatomic particles
- Discovery of electron
- Discovery of proton
- Atomic models
- Rutherford's experiment
- Discovery of neutron
- Atomic number and mass number

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Frequently Asked Questions

What are the important topics in Structure of Atom for ICSE Class 11 Chemistry?

Key topics in Structure of Atom include Fundamental Particles and Early Atomic Ideas, Atomic Number, Mass Number, Isotopes and Isobars, Nature of Light and Electromagnetic Radiation, Planck's Theory and Photoelectric Effect. Study these first, then practise questions on each for Class 11 exams.

What do the concept maps for Structure of Atom show?

The 4 maps show how the ideas in Structure of Atom connect: Structure of Atom - Complete Concept Overview; Structure of Atom – Complete Chapter Overview. Each map is also written out as an outline on this page.

How should I revise Structure of Atom for Class 11 exams?

Learn the core ideas first, then work through the 89 practice questions on Structure of Atom. Revise definitions regularly and use flashcards for quick recall before the exam.

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

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Structure of Atom — Concept Maps

Studying Structure of Atom? Get the full interactive chapter.

Structure of Atom - Complete Concept Overview

The map in words

Structure of Atom – Complete Chapter Overview

The map in words

Flowchart showing the discharge tube experiment process and how cathode rays were identified as electrons

The map in words

Structure of Atom

The map in words

Frequently Asked Questions

Sources & Official References

More resources for Structure of Atom

Practice Quiz

Important Questions

Revision Notes

Formula Sheet

Chapter Summary

Study Plan

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Syllabus

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