Only a few lanthanides show an oxidation state other than 13. Two of these, europium
Chapter 23, Problem 23.32(choose chapter or problem)
Only a few lanthanides show an oxidation state other than 13. Two of these, europium (Eu) and terbium (Tb), are found near the middle of the series, and their unusual oxidation states can be associated with a half-filled f subshell. (a) Write the electron configurations of Eu21, Eu31, and Eu41. Why is Eu21 a common ion, whereas Eu41 is unknown? (b) Write the electron configurations of Tb21, Tb31, and Tb41. Would you expect Tb to show a 12 or a 14 oxidation state? Explain.
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