JJ Thomson is known for developing which model in 1898?

Question

Question

This question was previously asked in

SSC MTS 2024 Official Paper (Held On: 23 Oct, 2024 Shift 1)

Answer 1

The correct answer is Plum Pudding Model.

Key Points

J.J. Thomson proposed the Plum Pudding Model of the atom in 1898 after his discovery of the electron in 1897.
According to this model, the atom is composed of a positively charged sphere with negatively charged electrons embedded within it, resembling a "plum pudding."
The model suggested that the positive charge is uniformly distributed throughout the atom, balancing the negative charge of the electrons.
It was the first model to include the electron, an important step in understanding atomic structure.
This model was later disproved by Ernest Rutherford’s Gold Foil Experiment in 1909, which led to the discovery of the nucleus.

Additional Information

Electron Discovery:
- J.J. Thomson discovered the electron in 1897 through his experiments with cathode rays.
- This discovery established that atoms are divisible and contain smaller subatomic particles.
Gold Foil Experiment:
- In 1909, Ernest Rutherford conducted the Gold Foil Experiment, which demonstrated that atoms have a small, dense, positively charged nucleus.
- This experiment invalidated the Plum Pudding Model, leading to the Nuclear Model of the atom.
Atomic Model Evolution:
- The Plum Pudding Model was an early attempt to explain atomic structure but lacked experimental support for the arrangement of charges.
- It was followed by Rutherford’s Nuclear Model and later by Niels Bohr’s Planetary Model.
Modern Atomic Theory:
- The current understanding of atomic structure is based on quantum mechanics, incorporating the wave-particle duality of electrons and probabilistic electron clouds.