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The electronic configurations of bivalent europium and trivalent cerium are : (atomic number : \( \mathrm{Xe}=54, \mathr…

Q1

The electronic configurations of bivalent europium and trivalent cerium are :

(atomic number : \( \mathrm{Xe}=54, \mathrm{Ce}=58, \mathrm{Eu}=63 \) )

a

\( [\mathrm{Xe}] 4 \mathrm{f}^{4} \) and \( [\mathrm{Xe}] 4 \mathrm{f}^{9} \)

b

\( [\mathrm{Xe}] 4 \mathrm{f}^{7} \) and \( [\mathrm{Xe}] 4 \mathrm{f}^{1} \)

c

\( [\mathrm{Xe}] 4 \mathrm{f}^{7} 6 \mathrm{~s}^{2} \) and \( [\mathrm{Xe}] 4 \mathrm{f}^{2} 6 \mathrm{s}^{2} \)

d

\( [\mathrm{Xe}] 4 \mathrm{f}^{2} \) and \( [\mathrm{Xe}] 4 \mathrm{f}^{7} \)

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