Gadolinium (atomic number $= 64$) is a member of the $4f$ series. Its electronic configuration in the $+3$ oxidation state is $[Xe] 4f^7$. What is the ground state electronic configuration of gadolinium?
- A$[Xe] 4f^{10}$
- B$[Xe] 4f^8 6s^2$
- C$[Xe] 4f^7 5d^3$
- D$[Xe] 4f^7 5d^1 6s^2$
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