Europium (, ) forms a highly stable divalent cation () strictly due to its exceptional half-filled electronic configuration. However, when placed in an aqueous chemical environment, how does the ion t

Question

Europium ($Eu$, $Z=63$) forms a highly stable divalent cation ($Eu^{2+}$) strictly due to its exceptional $4f^7$ half-filled electronic configuration. However, when placed in an aqueous chemical environment, how does the $Eu^{2+}$ ion typically behave?

Prashant Kotian · Accepted Answer

Correct answer: B. While possesses a highly stable half-filled configuration, the overarching thermodynamic stability for ALL Lanthanides in aqueous solutions is rigidly the oxidation state. Therefore, has a very strong inherent tendency to lose one more electron to become , thereby strictly acting as a powerful and highly effective reducing agent.

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