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Chapter 2: Problem 14

Had the plum-pudding model been valid, how would the results of the gold-foil experiment have differed from what Geiger and Marsden actually observed?

Short Answer

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Short Answer: If the plum-pudding model had been valid, the gold-foil experiment would have yielded different results, with alpha particles passing through the gold foil with little to no deflection and no bouncing back. This would have been consistent with the distributed positive charge throughout the atom, as per the plum-pudding model. Instead, the actual results led to the rejection of the plum-pudding model and the development of the nuclear model of the atom, which better explained the observations and provided crucial evidence for our current understanding of atomic structure.

Step by step solution

01

Describe the plum-pudding model

The plum-pudding model, proposed by J.J. Thomson in 1904, describes the atom as being made up of negatively charged electrons distributed within a positively charged cloud. This model resembles a plum pudding, with the negatively charged electrons representing the plums and the positively charged cloud representing the pudding.
02

Describe the gold-foil experiment

The gold-foil experiment, conducted by Ernest Rutherford, Hans Geiger, and Ernest Marsden in 1909, involved the firing of alpha particles (helium nuclei) at a thin gold foil. They placed a fluorescent screen around the foil and observed the scattering patterns when the alpha particles interacted with the gold atoms. They expected the alpha particles to pass through the foil with little deflection, based on the plum-pudding model.
03

Describe the actual results of the gold-foil experiment

Contrary to the expected results, Geiger and Marsden observed that while most alpha particles passed through the foil with little deflection, some were deflected at large angles, and a few even bounced back. This suggested that the plum-pudding model was incorrect, as it could not explain the observed results.
04

Discuss how results would have differed if the plum-pudding model were valid

If the plum-pudding model had been valid, the alpha particles would not have experienced strong deflections, as the positive charge would be distributed throughout the atom. Most of the alpha particles would have passed through the gold foil with little to no deflection, and none would have bounced back, as there would be no concentrated positive charge in the atom to cause significant repulsion.
05

Explain the importance of the gold-foil experiment results

The results of the gold-foil experiment led to the rejection of the plum-pudding model and the development of the nuclear model of the atom. The nuclear model, proposed by Rutherford, posits that the atom consists of a small, dense, positively charged nucleus, surrounded by negatively charged electrons in orbit. The gold-foil experiment's results provided crucial evidence for our current understanding of atomic structure.

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