The electronic configurations of Eu(Atomic No. 63), Gd(Atomic No. 64) and Tb (Atomic No. 65) are

Question

The electronic configurations of Eu(Atomic No. 63), Gd(Atomic No. 64) and Tb (Atomic No. 65) are (A) [X e] 4 f7 6 s2,[X e] 4 f8 6 s2 and [X e] 4 f8 5 d1 6 s2 (B) [X e] 4 f7 5 d1 6 s2,[X e] 4 f7 5 d1 6 s2 and [X e] 4 f9 6 s2 (C) [× e] 4 f6 5 d1 6 s2,[× e] 4 f7 5 d1 6 s2 and [× e] 4 f8 5 d1 6 s2 (D) [X e] 4 f7 6 s2,[X e] 4 f7 5 d1 6 s2 and [X e] 4 f9 6 s2

Tardigrade Admin · Accepted Answer

Eu (63)=[X e] 4 f7 6 s2 Gd (64)=[X e] 4 f7 5 d1 6 s2 Tb (65)=[X e] 4 f9 6 s2

Q. The electronic configurations of Eu(Atomic No. 63), Gd(Atomic No. 64) and Tb (Atomic No. 65) are

$[X e] 4 f^{7} 6 s^{2}, [X e] 4 f^{8} 6 s^{2}$ and $[X e] 4 f^{8} 5 d^{1} 6 s^{2}$

$[X e] 4 f^{7} 5 d^{1} 6 s^{2}, [X e] 4 f^{7} 5 d^{1} 6 s^{2}$ and $[X e] 4 f^{9} 6 s^{2}$

$[\times e] 4 f^{6} 5 d^{1} 6 s^{2}, [\times e] 4 f^{7} 5 d^{1} 6 s^{2}$ and $[\times e] 4 f^{8} 5 d^{1} 6 s^{2}$

$[X e] 4 f^{7} 6 s^{2}, [X e] 4 f^{7} 5 d^{1} 6 s^{2}$ and $[X e] 4 f^{9} 6 s^{2}$

Eu $(63) = [X e] 4 f^{7} 6 s^{2}$
Gd $(64) = [X e] 4 f^{7} 5 d^{1} 6 s^{2}$
Tb $(65) = [X e] 4 f^{9} 6 s^{2}$

Q. The electronic configurations of Eu(Atomic No. 63), Gd(Atomic No. 64) and Tb (Atomic No. 65) are

[Xe]4f76s2,[Xe]4f86s2 and [Xe]4f85d16s2

[Xe]4f75d16s2,[Xe]4f75d16s2 and [Xe]4f96s2

[×e]4f65d16s2,[×e]4f75d16s2 and [×e]4f85d16s2

[Xe]4f76s2,[Xe]4f75d16s2 and [Xe]4f96s2

Eu (63)=[Xe]4f76s2 Gd (64)=[Xe]4f75d16s2 Tb (65)=[Xe]4f96s2

$[X e] 4 f^{7} 6 s^{2}, [X e] 4 f^{8} 6 s^{2}$ and $[X e] 4 f^{8} 5 d^{1} 6 s^{2}$

$[X e] 4 f^{7} 5 d^{1} 6 s^{2}, [X e] 4 f^{7} 5 d^{1} 6 s^{2}$ and $[X e] 4 f^{9} 6 s^{2}$

$[\times e] 4 f^{6} 5 d^{1} 6 s^{2}, [\times e] 4 f^{7} 5 d^{1} 6 s^{2}$ and $[\times e] 4 f^{8} 5 d^{1} 6 s^{2}$

$[X e] 4 f^{7} 6 s^{2}, [X e] 4 f^{7} 5 d^{1} 6 s^{2}$ and $[X e] 4 f^{9} 6 s^{2}$

Eu $(63) = [X e] 4 f^{7} 6 s^{2}$
Gd $(64) = [X e] 4 f^{7} 5 d^{1} 6 s^{2}$
Tb $(65) = [X e] 4 f^{9} 6 s^{2}$