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Chemistry Question on d -and f -Block Elements

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

A

[Xe]4f75d16s2[ Xe ] 4 f ^{7} 5 d ^{1} 6 s ^{2}

B

[Xe]4f65d26s2[ Xe ] 4 f ^{6} 5 d ^{2} 6 s ^{2}

C

[Xe]4f86d2[ Xe ] 4 f ^{8} 6 d ^{2}

D

[Xe]4f95s1[ Xe ] 4 f ^{9} 5 s ^{1}

Answer

[Xe]4f75d16s2[ Xe ] 4 f ^{7} 5 d ^{1} 6 s ^{2}

Explanation

Solution

Electronic configuration of Gadolinium,with atomic number 64 is [Xe]4f75d16s2[Xe] 4f^{7} 5d^{1} 6s^{2} as half filled orbitals are more stable than incompletely filled orbitals.