Chapter 2 — Structure of Atom

Class 11 Chemistry Chapter 2 covers the structure of atoms, including sub-atomic particles (electrons, protons, neutrons), atomic models from Thomson to Bohr, electromagnetic radiation, and the quantum mechanical model with orbitals and quantum numbers.

Structure of Atom explains how atoms are built from sub-atomic particles discovered through historical experiments. Thomson's model and Rutherford's nuclear model laid groundwork, while Bohr's model introduced energy levels and quantization. The chapter bridges classical and quantum mechanics, explaining electromagnetic radiation, photons, atomic spectra, de Broglie's wave-particle duality, Heisenberg's uncertainty principle, and the quantum mechanical model with orbitals defined by principal, azimuthal, magnetic, and spin quantum numbers.

1. 01Electrons, protons, and neutrons are fundamental sub-atomic particles with specific charge and mass properties
2. 02Rutherford's nuclear model showed most atomic mass is concentrated in a tiny nucleus with electrons orbiting around it
3. 03Bohr's model explained hydrogen's line spectrum using quantized energy levels and angular momentum
4. 04Electromagnetic radiation exhibits dual nature: both wave-like (frequency, wavelength) and particle-like (photons, energy E=hν) properties
5. 05Heisenberg's uncertainty principle states position and momentum of electrons cannot be determined simultaneously with precision
6. 06Quantum mechanical model uses atomic orbitals (wave functions) and four quantum numbers (n, l, m_l, m_s) to describe electron probability distributions