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The outer electronic configuration of Gd (Atomic No : 64) is

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The outer electronic configuration of Gd (Atomic No : 64) is
(a) 4f3 5d5 6s2 

(b) 4f8 5d0 6s2

(c) 4f4 5d4 6s2 

(d) 4f7 5d1 6s2

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(d) : The electronic configuration of
64Gd = [Xe]54 4f7 5d1 6s2

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