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 & Chemical Reactivity
9th Edition
ISBN:9781133949640
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter22: The Chemistry Of The Transistion Elements
Section22.2: Metallurgy
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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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