The electronic configuration

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Question:
The electronic configuration of gadolinium (Atomic number 64) is

(i) [Xe] 4f 3 5d5 6s2

(ii) [Xe] 4f7 5d2 6s1

(iii) [Xe] 4f7 5d1 6s2

(iv) [Xe] 4f8 5d6 6s2

Solution:

Option (iii) [Xe] 4f7 5d1 6s2 is the answer.

The electronic configuration

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