General Chemistry: Principles and Modern Applications (10th Edition)

by Petrucci, Ralph H.; Herring, F. Geoffrey; Madura, Jeffry D.; Bissonnette, Carey

Published by Pearson Prentice Hal

ISBN 10: 0132064529

ISBN 13: 978-0-13206-452-1

Chapter 2 - Atoms and the Atomic Theory - Exercises - Self-Assessment Exercises - Page 66: 100

Answer

(a) the mass of an atom is concentrated in a positively charged nucleus.

Work Step by Step

This is known as Rutherford's model of the atom, which was proposed in 1911 after conducting experiments in which alpha particles were scattered by thin metal foils. The results of these experiments led Rutherford to propose that atoms have a small, dense, positively charged nucleus at the center, surrounded by negatively charged electrons.

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