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The electronic configurations of Eu (Ato...

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

A

`[Xe] 4 f^(7) 6s^(2) , [Xe] 4f^(8) 6s^(2) and [Xe] 4f^(8) 5d^(1) 6s^(2)`

B

`[Xe] 4f^(7) 5d^(1) 6s^(2) , [Xe] 4f^(7) 5d^(1) 6s^(2) ` and `[Xe] 4f^(9) 6s^(2)`

C

`[Xe] 4f^(6) 5d^(1) 6s^(2) , [Xe] 4f^(7) 5d^(1) 6s^(2) ` and `[Xe] 4f^(8) 5d^(1) 6s^(2)`

D

`[Xe] 4f^(7) 6s^(2) , [Xe] 4f^(7) 5d^(1) 6s^(2)` and `[Xe] 4f^(9) 6s^(2)`

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