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

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

AIPMTAIPMT 2015The d-and f-Block Elements

Solution:

Electronic configuration of Gadolinium,with atomic number 64 is $[Xe] 4f^{7} 5d^{1} 6s^{2}$ as half filled orbitals are more stable than incompletely filled orbitals.