The Plum Pudding Model Simplified Revision Notes for GCSE AQA Physics Combined Science

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Learn about Atoms & Isotopes for your GCSE Physics Combined Science Exam. This Revision Note includes a summary of Atoms & Isotopes for easy recall in your Physics Combined Science exam

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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.

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