Use Rutherford's gold-foil experiment to answer each of the...

Use Rutherford's gold-foil experiment to answer each of the following: (4.3)
a. What did Rutherford expect to happen when he aimed particles at the gold foil?
b. How did the results differ from what he expected?
c. How did he use the results to propose a model of the atom?

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Key Concepts

Rutherford Scattering Experiment

This experiment involved directing high-energy, positively charged particles at a thin metallic foil in order to study their scattering behavior. It served as a critical test of the then-established atomic theories and helped reveal details of atomic structure based on the observed deflections.

Plum Pudding Model

Before Rutherford’s findings, the prevailing atomic theory, known as the plum pudding model, proposed that atoms were composed of a diffuse positive charge with negatively charged electrons scattered throughout. This model predicted that charged particles would pass through atomic material with minimal deflection.

Discovery of the Atomic Nucleus

The unexpected observation that some particles were deflected at large angles indicated the existence of a small, dense, positively charged center within the atom. This nucleus contained the bulk of the atom’s mass, leading to a fundamental shift in the understanding of atomic structure.

Revised Atomic Structure

Based on the scattering results, Rutherford proposed a new model of the atom featuring a central nucleus around which electrons orbit. This nuclear model replaced the earlier diffuse model and laid the foundation for modern atomic theory.

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