Gadolinium belongsd to 4f series. It's a...

Gadolinium belongsd to 4f series. It's atomic number is 64. which of the following is the correct electronic configuration of gadolinium ?

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

`[Xe] 4f^(6) 5d^(2) 6s^2`

`[Xe] 4f^(8) 6d^2`

`[Xe] 4f^(9) 5s^1`

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The correct Answer is:

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

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