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

(i) [Xe] 4f75d16s2

(ii) [Xe] 4f65d26s2

(iii) [Xe] 4f86d2

(iv) [Xe] 4f95s1

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(i) [Xe] 4f75d16s2

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