Gadolinium belongs to the $4f$ series. Its atomic number is $64$. Which of the following is the correct electronic configuration of gadolinium?
- A$[Xe] 4f^9 5s^1$
- B$[Xe] 4f^7 5d^1 6s^2$
- C$[Xe] 4f^6 5d^2 6s^2$
- D$[Xe] 4f^8 6d^2$
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