The electronic configurations of $Eu$ (Atomic No. $63$),$Gd$ (Atomic No. $64$) and $Tb$ (Atomic No. $65$) are
- A$[Xe]4f^6 \, 5d^1 \, 6s^2, [Xe]4f^7 \, 5d^1 \, 6s^2$ and $[Xe]4f^8 \, 5d^1 \, 6s^2$
- B$[Xe] \, 4f^7 \, 6s^2, [Xe] \, 4f^7 \, 5d^1 \, 6s^2$ and $[Xe] \, 4f^9 \, 6s^2$
- C$[Xe] \, 4f^7 \, 6s^2, [Xe] \, 4f^8 \, 6s^2$ and $[Xe] \, 4f^8 \, 5d^1 \, 6s^2$
- D$[Xe] \, 4f^6 \, 5d^1 \, 6s^2, [Xe] \, 4f^7 \, 5d^1 \, 6s^2$ and $[Xe] \, 4f^9 \, 6s^2$
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