Chemistry (4th Edition)

Published by McGraw-Hill Publishing Company
ISBN 10: 0078021529
ISBN 13: 978-0-07802-152-7

Chapter 22 - Questions and Problems - Page 1004: 22.29

Answer

Sc 3+ is colorless because it has no d-orbital electrons whereas Ti 3+ has d-orbital electrons.

Work Step by Step

This is because Sc 3+ has no more d-orbital electrons and thus crystal field splitting can no longer occur. This is because the d-orbital is no longer present whereas in Ti 3+ the d-orbital is still present so that crystal field splitting can occur.
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