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Q.

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

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a

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

b

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

c

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

d

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

answer is B.

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Detailed Solution

$Gd (Z = 64) . . . [Xe] 4 f^{7} 5 d^{1} 6 s^{2}$

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