Evolution of the Atomic Model

Evolution of the Atomic Model

Overview

• The atomic model has undergone significant changes over time, reflecting advancements in scientific understanding and experimental techniques.

Dalton's Atomic Model (1803)

• Proposed that atoms are the indivisible units of an element.
• Represented the atom as a solid sphere, indicating no internal structure.

JJ Thomson's Model (1904)

• Conducted the cathode ray experiment which led to the discovery of subatomic particles.
• Introduced the Plum Pudding Model:
  • Suggested that atoms are composed of smaller, charged particles, specifically electrons (−) embedded in a positively charged