The \( \mathrm{Eu}^{2+} \) ion is a strong reducing agent in spite of its ground state electroni...

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The \( \mathrm{Eu}^{2+} \) ion is a strong reducing agent in spite of its ground state electronic configuration (outermost) : [Atomic number of \( \mathrm{Eu}=63] \)
(a) \( 4 \mathrm{f}^{8} 6 \mathrm{~s}^{2} \)
(b) \( 4 \mathrm{f}^{7} \)
(c) \( 4 \mathrm{f}^{7} 6 \mathrm{~s}^{2} \)
(d) \( 4 \mathrm{f}^{6} \)
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