Gadolinium is often used as a contrasting agent. The electron configuration for Gadolinium is [Xe]6s24f75d1 and is an exception to the rules you have been taught. Which rule or rules does this configuration break? B. Why does being an exception to this rule make Gadolinium an even more effective contrasting agent than it would be otherwise?

Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter20: Chemistry Of Selected Transition Elements And Coordination Compounds
Section: Chapter Questions
Problem 16QRT: Which Period 4 transition-metal ions are isoelectronic with (a) Zn2+ (b) Mn2+ (c) Cr3+ (d) Fe3+
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Q1. Gadolinium is often used as a contrasting agent. The electron configuration for Gadolinium is [Xe]6s24f75d1 and is an exception to the rules you have been taught. Which rule or rules does this configuration break? B. Why does being an exception to this rule make Gadolinium an even more effective contrasting agent than it would be otherwise? Q2. Which element(s) would you expect to behave similarly to Gadolinium? What properties of would you expect to be the same, what would be different?
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