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.

Start practice

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.

Topic 2.2

Radiation, Photoelectric Effect and Matter Waves

Electromagnetic radiation, Planck quantum theory, photoelectric effect, de Broglie relation and Heisenberg uncertainty principle.

Topic 2.3

Bohr Model and Hydrogen Spectrum

Bohr postulates, radius and energy of hydrogen-like orbits, line spectra and spectral series.

Topic 2.4

Quantum Mechanical Model and Orbitals

Quantum numbers, shells, subshells, orbitals, nodal planes, orbital shapes and capacities.

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.

Please provide feedback

Tell us what would make StudyLoop better.

Feedback type

The current page address, technical context, selected issue type, and any details or email you enter are sent with this report. Your StudyLoop profile and answers are not sent.