Class 12 Physics - Atomic Structure Lecture

Overview

• Understanding the size of the nucleus relative to the atom
• History and development of atomic models
• Dalton's Atomic Theory
• Thomson's Plum Pudding Model
• Rutherford's Nuclear Model
• Bohr’s Model of Atom
• Emission and Absorption Spectra

Size of Nucleus vs Atom

• Nucleus size comparison: If the nucleus is the size of a cricket ball, the atom would be a sphere with a radius of 5 km.
• Atom is extremely small, but the nucleus is even smaller in comparison.

Historical Development of Atomic Theory

• 500 BC: Democritus coins the term