Lanthanoid ions with $4f^7$ configuration are: (A) Eu$^{2+}$ (B) Gd$^{3+}$ (C) Eu$^{3+}$ (D) Tb$^{3+}$ (E) Sm$^{2+}$ Choose the correct answer from the options given below:

Question

Statement-I : The correct increasing order of bond length among the following is $O_2^+ < O_2 < O_2^- < O_2^{2-}$.
Statement-II : The correct order of number of unpaired electrons is $O_2^{2-} < O_2^+ < O_2^- < O_2$.

Answer 1

Step 1: Determine electronic configurations.

$_{63}$Eu$^{2+}$ - [Xe] 4f$^7$ 6s$^0$
$_{64}$Gd$^{3+}$ - [Xe] 4f$^7$ 5d$^0$ 6s$^0$
$_{63}$Eu$^{3+}$ - [Xe] 4f$^6$ 6s$^0$
$_{65}$Tb$^{3+}$ - [Xe] 4f$^8$ 6s$^0$
$_{62}$Sm$^{2+}$ - [Xe] 4f$^6$ 6s$^0$

Step 2: Identify ions with 4f$^7$ configuration.

Based on the electronic configurations, Eu$^{2+}$ and Gd$^{3+}$ exhibit 4f$^7$ configurations.

Step 3: Select the appropriate option.

Consequently, the correct selection is options (A) and (B) exclusively.

Lanthanoid ions with \(4f^7\) configuration are: (A) Eu\(^{2+}\) (B) Gd\(^{3+}\) (C) Eu\(^{3+}\) (D) Tb\(^{3+}\) (E) Sm\(^{2+}\) Choose the correct answer from the options given below:

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The Correct Option is A

Solution and Explanation

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