The electronic configuration of gadolinium (Atomic number 64) is

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C
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4f7 5d1 6s2
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Chemistry lover

The answer is C 4f7 5d1 6s2, this is the exception if u will follow electronic configuration rule but here point u need to remember such type of element, we have also seen like Chromium(Cr), Cupper(Cu).
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option c.
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