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The electronic configuration of gadolinium (atomic no. 64) is:
(1) [Xe]4s8 5d9 6s2
(2) [Xe] 4s1 5d1 6s2
(3) [Xe]4s3 5d5 6s2
(4) [Xe]4f6 5d2 6s2
Ans: [Xe] 4s1 5d1 6s2
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