Lanthanoid ions with 4 f^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 :

Correct answer: C. (A) and (B) only aligned & _ 63 Eu^ 2+ -[Xe] 4 f^7 6 ~s^0 & _ 64 Gd^ 3+ -[Xe] 4 f^7 5 ~d^0 6 ~s^0 & _ 63 Eu^ 3+ -[Xe] 4 f^6 6 ~s^0 & _ 65 ~Tb^ 3+ -[Xe] 4 f^8 6 ~s^0 & _ 62 Sm^ 2+ -[Xe] 4 f^6 6 ~s^0 & Eu^ 2+ & Gd^ 3+ aligned

JEE Main 202522 JanuaryMorning Shift

Exam: JEE Main
Year: 2025
Date: 22 January
Shift: Morning Shift
Subject: Chemistry
Chapter: d and f Block Elements

JEE Main 2025 · 22 January · Morning Shift · Chemistry · d and f Block Elements

Lanthanoid ions with 4 f^7 configuration are : (A) Eu^ 2+ (B) Gd^...

Lanthanoid ions with

4 f^7

configuration are : (A)

\mathrm{Eu}^{2+}

(B)

\mathrm{Gd}^{3+}

(C)

\mathrm{Eu}^{3+}

(D)

\mathrm{Tb}^{3+}

(E)

\mathrm{Sm}^{2+}

Choose the correct answer from the options given below :

Options

A(A) and (D) only
B(B) and (C) only
C(A) and (B) only
D(B) and (E) only

Correct answer

C. (A) and (B) only

Step-by-step solution

\begin{aligned} & { }_{63} \mathrm{Eu}^{2+}-[\mathrm{Xe}] 4 \mathrm{f}^7 6 \mathrm{~s}^0 \\ & { }_{64} \mathrm{Gd}^{3+}-[\mathrm{Xe}] 4 \mathrm{f}^7 5 \mathrm{~d}^0 6 \mathrm{~s}^0 \\ & { }_{63} \mathrm{Eu}^{3+}-[\mathrm{Xe}] 4 \mathrm{f}^6 6 \mathrm{~s}^0 \\ & { }_{65} \mathrm{~Tb}^{3+}-[\mathrm{Xe}] 4 \mathrm{f}^8 6 \mathrm{~s}^0 \\ & { }_{62} \mathrm{Sm}^{2+}-[\mathrm{Xe}] 4 \mathrm{f}^6 6 \mathrm{~s}^0 \\ & \mathrm{Eu}^{2+} & \mathrm{Gd}^{3+}\end{aligned}

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