CBSE 11 Chemistry · U2
Structure of Atom
CBSE Class 11 Chemistry Unit II: discovery of subatomic particles, atomic models, electromagnetic radiation, photoelectric effect, Bohr model of hydrogen atom, quantum numbers, orbitals, and electronic configuration.
Test yourself
A focused, distraction-free run through 50 multiple-choice questions. Hints if you need them; your score at the end.
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Topic 2.1
Subatomic Particles and Atomic Models
Discovery of electron, proton and neutron; atomic number, mass number, isotopes, isobars, Thomson model and Rutherford model.
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Topic 2.2
Radiation, Photoelectric Effect and Matter Waves
Electromagnetic radiation, Planck quantum theory, photoelectric effect, de Broglie relation and Heisenberg uncertainty principle.
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Topic 2.3
Bohr Model and Hydrogen Spectrum
Bohr postulates, radius and energy of hydrogen-like orbits, line spectra and spectral series.
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Topic 2.4
Quantum Mechanical Model and Orbitals
Quantum numbers, shells, subshells, orbitals, nodal planes, orbital shapes and capacities.
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Topic 2.5
Electronic Configuration and Stability
Aufbau principle, Pauli exclusion principle, Hund's rule, electronic configurations of atoms and ions, and stability of half-filled and completely filled subshells.
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