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Q.

Lanthanoid ions with 4f7 configuration are :
(A) Eu2+
(B) Gd3+
(C) Eu3+
(D) Tb3+
(E) Sm2+
Choose the correct answer from the options given below :

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a

(B) and (E) only

b

(A) and (D) only

c

(B) and (C) only

d

(A) and (B) only

answer is A.

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Detailed Solution

 63Eu2+[Xe]4f76s0 64Gd3+[Xe]4f75d06s0 63Eu3+[Xe]4f66s0 5Tb3+[Xe]4f86s0 62Sm2+[Xe]4f66s0Eu2+&Gd3+

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Lanthanoid ions with 4f7 configuration are :(A) Eu2+(B) Gd3+(C) Eu3+(D) Tb3+(E) Sm2+Choose the correct answer from the options given below :