Question

ques sep 8/25 1. how does j.j. thomson’s atomic model differ from the model depicted by a bohr diagram?

Explanation:

To answer how J.J. Thomson’s atomic model differs from a Bohr diagram, we analyze the key features of each model:

J.J. Thomson’s “Plum Pudding” Model (1904):

• Structure: Atoms are a uniform, positively charged “soup” (or sphere) with negatively charged electrons embedded within it, like plums in a pudding.
• Electron Behavior: Electrons are randomly distributed in the positive charge; no specific energy levels or orbits are proposed.

Bohr’s Atomic Model (1913):

• Structure: Atoms have a small, dense, positively charged nucleus at the center. Electrons orbit the nucleus in specific, quantized energy levels (or shells) with fixed radii.
• Electron Behavior: Electrons can only exist in these discrete energy levels (e.g., \( n = 1, 2, 3, \dots \)) and absorb/emits energy (photons) when moving between levels.

Key Differences:

Feature	J.J. Thomson’s Model	Bohr’s Model
Electron Location	Electrons embedded in a positive “soup.”	Electrons orbit the nucleus in fixed, quantized energy levels.
Energy Levels	No defined energy levels (electrons move freely in the positive sphere).	Electrons occupy specific energy levels (shells) with fixed energy and radius.

In short, Thomson’s model treats the atom as a uniform positive sphere with embedded electrons, while Bohr’s model introduces a nucleus and quantized electron orbits (energy levels).

Answer:

J.J. Thomson’s atomic model (plum pudding) has a uniform positive charge with embedded electrons (no nucleus or energy levels), while Bohr’s model has a nucleus and electrons in quantized, orbiting energy levels.