The Plum Pudding Model (AQA GCSE Physics): Revision Notes
📚 Revision Notes
4.1.6 The Plum Pudding Model
infoNote
The plum pudding model is an early 20th-century atomic model proposed by J.J. Thomson in 1904, following his discovery of the electron. This model was an attempt to describe the structure of the atom at a time when the internal structure of the atom was not well understood.
1800 - Dalton
- Everything was made of tiny spheres (atoms) that could not be divided
1897 - J.J. Thomson
- Discovered the electron
- Formed the Plum Pudding Model
The Plum Pudding Model:
- Sphere of Positive Charge
- Negative Electrons dispersed throughout the positive "pudding"
- The overall charge of an atom is neutral, so the negative electrons were dispersed through the positive "pudding" to cancel out the charges.