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The plum pudding model was the first scientific model of the atom to describe an internal structure. It was first proposed by J. J. Thomson in 1904 following his discovery of the electron in 1897, and was rendered obsolete by Ernest Rutherford 's discovery of the atomic nucleus in 1911.
- Thomson Model Introduction
- Table of Contents
- Postulates of Thomson’s Atomic Model
- Limitations of Thomson’s Atomic Model
Thomson atomic modelwas proposed by William Thomson in the year 1900. This model explained the description of an inner structure of the atom theoretically. It was strongly supported by Sir Joseph Thomson, who had discovered the electron earlier. During cathode ray tube experiment, a negatively charged particle was discovered by J.J. Thomson. This e...
Postulate 1: An atom consists of a positively charged sphere with electrons embedded in it Postulate 2: An atom as a whole is electrically neutral because the negative and positive charges are equal in magnitude Thomson atomic model is compared to watermelon. Where he considered: 1. Watermelon seeds as negatively charged particles 2. The red part o...
It failed to explain the stability of an atom because his model of atom failed to explain how a positive charge holds the negatively charged electrons in an atom. Therefore, This theory also failed...Thomson’s model failed to explain the scattering of alpha particles by thin metal foilsNo experimental evidence in its support- 32 sec
Popularly known as the plum pudding model, it had to be abandoned (1911) on both theoretical and experimental grounds in favour of the Rutherford atomic model, in which the electrons describe orbits about a tiny positive nucleus. See also atomic model.
- The Editors of Encyclopaedia Britannica
Jun 18, 2023 · The plum pudding model was the first model to assign a specific inner structure to an atom, and it was based on experimental evidence and mathematical formulas. However, it was soon replaced by a more accurate model of the atom after new discoveries were made.
Jun 2, 2024 · Learn how Thomson discovered the electron and proposed a model of the atom as a sphere of positive charge with negative plums inside. Find out how this model failed to explain the emission spectra of elements and was replaced by Rutherford's nuclear model.
- 7 min
Jan 19, 2016 · Learn about the Plum Pudding Model, a 19th century atomic theory that proposed electrons as corpuscles in a sea of positive charge. Discover how it was developed, tested and disproved by later experiments and discoveries.
Sep 6, 2013 · Thomson's atomic theory has informally been called the “plum-pudding” model, but the early history of this expression has not been elucidated. The expression is not in Thomson 1, the seminal paper in which Thomson developed his atomic theory, nor is it in any of his subsequent publications.
