Chemistry: Molecular Approach (4th Edition)

Published by Pearson
ISBN 10: 0134112830
ISBN 13: 978-0-13411-283-1

Chapter 25 - Exercises - Page 1153: 12


Color is dependent on free electrons that are present for excitation.

Work Step by Step

The electron configuration of Sc is \[[Ar]4{{s}^{2}}3{{d}^{1}}.\] During the formation of \[S{{c}^{3+}}\] it attains noble gas configuration and no free electrons are present for excitation, so it is colorless. The electron configuration of Ti is \[[Ar]4{{s}^{2}}3{{d}^{2}}\]. During the formation of \[T{{i}^{3+}}\], its electron configuration becomes \[[Ar]2{{d}^{1}}.\] It possesses a single electron that can be excited by the absorption of light, so it is colored.
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