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Answer:
1. Solid Sphere Model:
- Scientist: John Dalton
- In the Solid Sphere Model, atoms were considered indivisible and indestructible spheres that make up all matter, each element having its unique properties due to different-sized spheres.
2. Plum Pudding Model:
- Scientist: J.J. Thomson
- The Plum Pudding Model proposed by Thomson described atoms as a diffuse sea of positive charge with negatively charged electrons embedded within, resembling plums in a pudding.
3. Nuclear Model:
- Scientist: Ernest Rutherford
- In the Nuclear Model, Rutherford proposed that atoms have a small, dense, positively charged nucleus at the center containing protons, with electrons orbiting around the nucleus in a mostly empty space.
4. Planetary Model:
- Scientist: Niels Bohr
- The Planetary Model by Bohr depicted electrons orbiting around the nucleus in fixed, circular paths or energy levels, similar to planets revolving around the sun, with each energy level corresponding to a specific distance from the nucleus.