CBSE · Class 11 · Chemistry · Chapter 2

Structure of Atom

Atomic models, quantum numbers and electronic configuration.

12 lessons 220 min
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Lessons in this chapter

  1. 1Discovering the Particles Inside AtomsFollow the experiments that revealed electrons, protons, and neutrons.
  2. 2From Atomic Models to the NucleusUse scattering evidence to explain the nucleus, atomic identity, and the limits of early models.
  3. 3Electromagnetic Radiation and Its MeasurementsConnect wavelength, frequency, and wavenumber to the electromagnetic spectrum.
  4. 4Quantised Light and the Photoelectric EffectExplain energy packets, black-body observations, and the ejection of electrons by light.
  5. 5Atomic Spectra and the Hydrogen PatternRead emission and absorption spectra as evidence of discrete atomic energy differences.
  6. 6Bohr’s Model and Hydrogen Energy LevelsUse stationary states to explain hydrogen spectra, excitation, and ionisation.
  7. 7Matter Waves and the Limits of OrbitsDiscover why electron waves and uncertainty rule out a precise orbital path.
  8. 8The Quantum Model and Quantum NumbersDescribe electron states with wave functions, probability, and four quantum numbers.
  9. 9Orbital Shapes and NodesInterpret orbital pictures as probability patterns with characteristic shapes and zero-density surfaces.
  10. 10Orbital Energies and Filling RulesConnect shielding and orbital energy with the rules governing electron occupation.
  11. 11Writing Electronic ConfigurationsBuild electron arrangements, identify ions, and understand important configuration exceptions.
  12. 12Chapter Summary and PracticeConnect the experimental evidence, models, equations, and electron arrangements across the whole chapter.
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