Explain why SmCl2, EuCl2 and YbCl2 are crystalline salts with no colors whereas LaCl2, CeCl2 and PrCl2 have a metallic appearance and great electricity conduction.

Chemistry for Engineering Students
4th Edition
ISBN:9781337398909
Author:Lawrence S. Brown, Tom Holme
Publisher:Lawrence S. Brown, Tom Holme
Chapter8: Molecules And Materials
Section: Chapter Questions
Problem 8.29PAE
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Explain why SmCl2, EuCl2 and YbCl2 are crystalline salts with no colors whereas LaCl2, CeCl2 and PrCl2 have a metallic appearance and great electricity conduction.

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