Q1. What block of the periodic table would you expect to find the best contrasting agents in? Explain your reasoning.

Physical Chemistry
2nd Edition
ISBN:9781133958437
Author:Ball, David W. (david Warren), BAER, Tomas
Publisher:Ball, David W. (david Warren), BAER, Tomas
Chapter15: Introduction To Electronic Spectroscopy And Structure
Section: Chapter Questions
Problem 15.39E
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Q1. What block of the periodic table would you expect to find the best contrasting agents in? Explain your reasoning. Q2. 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? Q3. Why does being an exception to this rule make Gadolinium an even more effective contrasting agent than it would be otherwise? Q4.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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