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i. Write the observed outer electronic configuration of Eu. ii. What is the reason for this variation in electronic configuration?

Monjur Alahi

Expected outer electronic configuration of europium (Eu) is 6s2 4f6 5d1. However, it exhibits different than expected outer electronic configuration.

i. Write the observed outer electronic configuration of Eu.

ii. What is the reason for this variation in electronic configuration?


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Salim Ahmed Kawsar

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i. Observed outer electronic configuration of europium (Eu) is 6s2 4f7 5d0.

ii. In the observed electronic configuration of Eu, 4f subshell is half-filled which is a highly stable configuration. Therefore, observed electronic configuration of Eu varies than expected.

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