InterviewSolution
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InterviewSolution
| 1. |
Why is europium (II) more stable than cerium (II) ? |
| Answer» Europium (II) has electronic configuration `Eu^(2+)[Xe]4f^(7)5d^(@)=Eu^(2+)` while cerium (II) has electronic configuration ` Ce^(2+) = [Xe]4f^(2)5d^(@)."In" Eu^(2+)`, subshell is half filled and 5d- subshell is empty. Since half filled and completely filled electronic configuration are more stable, `Eu^(2+)` ions is more stable than `Ce^(2+)` in which neither 4f subshell nor 5d subshell is half filled or completely filled. | |