The electronic configuration of ${ }_{59} Pr$ $(Praseodymium)$ is
- A$[ { }_{54} Xe ] 4 f^2 5 d^1 6 s^2$
- B$[ { }_{54} Xe ] 4 f^1 5 d^2 6 s^2$
- C$[ { }_{54} Xe ] 4 f^3 6 s^2$
- D$[ { }_{54} Xe ] 4 f^3 5 d^2$
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