Lanthanoid ions with 4 f 7 configuration are: [2025]

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Q.
Lanthanoid ions with $4 f^{7}$ configuration are: [2025]

(A) ${Eu}^{2 +}$
(B) ${Gd}^{3 +}$
(C) ${Eu}^{3 +}$
(D) ${Tb}^{3 +}$
(E) ${Sm}^{2 +}$

1 (A) and (B) only

2 (B) and (C) only

3 (A) and (D) only

4 (B) and (E) only

Ans.
(1)

Ions Electronic configuration

(A)   ${}_{63}{Eu}^{2 +}$ ${}_{54}{[Xe]}$ $4 f^{7} 6 s^{0}$

(B)   ${}_{64}{Gd}^{3 +}$ ${}_{54}{[Xe]}$ $4 f^{7} 5 d^{0} 6 s^{0}$

(C)   ${}_{63}{Eu}^{3 +}$ ${}_{54}{[Xe]}$ $4 f^{6} 6 s^{0}$

(D)   ${}_{65}{Tb}^{3 +}$ ${}_{54}{[Xe]}$ $4 f^{8} 6 s^{0}$

(E)   ${}_{62}{Sm}^{2 +}$ ${}_{54}{[Xe]}$ $4 f^{6} 6 s^{0}$

Solution

Q.
Lanthanoid ions with $4 f^{7}$ configuration are: [2025]

(A) ${Eu}^{2 +}$
(B) ${Gd}^{3 +}$
(C) ${Eu}^{3 +}$
(D) ${Tb}^{3 +}$
(E) ${Sm}^{2 +}$

1 (A) and (B) only

2 (B) and (C) only

3 (A) and (D) only

4 (B) and (E) only

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Ions	Electronic configuration
(A) ${}_{63}{Eu}^{2 +}$	${}_{54}{[Xe]}$ $4 f^{7} 6 s^{0}$
(B) ${}_{64}{Gd}^{3 +}$	${}_{54}{[Xe]}$ $4 f^{7} 5 d^{0} 6 s^{0}$
(C) ${}_{63}{Eu}^{3 +}$	${}_{54}{[Xe]}$ $4 f^{6} 6 s^{0}$
(D) ${}_{65}{Tb}^{3 +}$	${}_{54}{[Xe]}$ $4 f^{8} 6 s^{0}$
(E) ${}_{62}{Sm}^{2 +}$	${}_{54}{[Xe]}$ $4 f^{6} 6 s^{0}$

Solution

Q. Lanthanoid ions with 4f7 configuration are: [2025] (A) Eu2+ (B) Gd3+ (C) Eu3+ (D) Tb3+ (E) Sm2+

1 (A) and (B) only

2 (B) and (C) only

3 (A) and (D) only

4 (B) and (E) only

Ans. (1) Ions Electronic configuration (A) Eu2+63 [Xe]544f76s0 (B) Gd3+64 [Xe]544f75d06s0 (C) Eu3+63 [Xe]544f66s0 (D) Tb3+65 [Xe]544f86s0 (E) Sm2+62 [Xe]544f66s0

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Q.
Lanthanoid ions with $4 f^{7}$ configuration are: [2025]

(A) ${Eu}^{2 +}$
(B) ${Gd}^{3 +}$
(C) ${Eu}^{3 +}$
(D) ${Tb}^{3 +}$
(E) ${Sm}^{2 +}$