Q2 / 155 · WBJEE 2024 · Chemistry

Identify the ion having $4 f^6$ electronic configuration.

  • A
    $\mathrm{Gd}^{3+}$
  • B
    $\mathrm{Sm}^{3+}$
  • Correct answer
    C
    $\mathrm{Sm}^{2+}$
  • D
    $\mathrm{Tb}^{3+}$

Solution

$\begin{aligned} & \text { Hint : }{ }_{62} \mathrm{Sm}=[\mathrm{Xe}] 4 \mathrm{f}^6 6 \mathrm{~s}^2 \\ & \therefore \mathrm{Sm}^{+2}=[\mathrm{xe}] 4 \mathrm{f}^6 6 \mathrm{~s}^0\end{aligned}$

Hence, the correct answer is option: 'C'.

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