Lanthanoid ions with $4{f}^{7}$ configuration are : (A) $E{u}^{2+}$ (B) $G{d}^{3+}$ (C) $E{u}^{3+}$ (D) $T{b}^{3+}$ (E) $S{m}^{2+}$ Choose the correct answer from the options given below

Question

YESPYQ · Accepted Answer

Correct answer: a) (A) and (B) only. $E{u}^{2+}:[Xe]4{f}^{7}6{s}^{0}\ G{d}^{3+}:[Xe]4{f}^{7}5{d}^{0}6{s}^{0}\ E{u}^{3+}:[Xe]4{f}^{6}6{s}^{0}\ T{b}^{3+}:[Xe]4{f}^{8}6{s}^{0}\ S{m}^{2+}:[Xe]4{f}^{6}6{s}^{0}$ Hence, only $E{u}^{2+}$ and $G{d}^{3+}$ have $4{f}^{7}$ configuration.

Lanthanoid ions with \(4{f}^{7}\) configuration are : (A) \(E{u}^{2+}\) (B) \(G{d}^{3+}\) (C) \(E{u}^{3+}\) (D) \(T{b}^{…

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