Lesson 3.1 – From Dalton to the Modern Atomic Model

Atomic models have evolved over time as scientists made new discoveries.

Key Developments:

• J.J. Thomson (1897): Discovered the electron and proposed the Plum Pudding Model.
• Ernest Rutherford (1911): Gold Foil Experiment → Nuclear Model.
• Niels Bohr (1913): Proposed energy levels for electrons.

Real-World Example:

• Why does hydrogen emit specific spectral lines?