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168. The electronic configurations of Eu (Atomic No. 63), Gd (Atomic No. 64) and Tb (Atomic No. 65) are: A [Xe]4f762, [Xe]4f75d652 and [Xe]4f%652 (2) [Xe]4f7652, [Xe]4f8 6s- and [Xe]4f85d652 (3) [Xe]4f65d6s2, [Xe]4f75d46s2 and [Xe]489652 (4) [Xe]4f65d16s2, [Xe]4f75d6s2 and Xe]4f85d2652

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The electronic configuration of bivalent europium and trivalent cerium, are: (Atomic Number : Xe = 54, Ce = 58, Eu = 63)
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Q2
THE ELECTRONIC CONFIGURATIONS OF EU(ATOMIC NO.63),Gd(ATOMIC NO.64),AND Tb(ATOMIC NO.65) IS [Xe]4f76s2,[Xe]4f75d16s2,and [Xe]4f9 6s2.MY QUESTION IS WHY IN Gd [atomic no.64]instead of placing one electron in 4f7 it is placed in 5d orbital while in Tb it is placed in 4f and the 5d is not taken in this case?
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The electronic configuration of Gd2+ is (at. No. of Gd is 64)


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Q4

The electronic configuration of gadolinium (Atomic number 64) is
(a) [Xe]4f35d56s2
(b) [Xe]4f75d26s1
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Q5
how to solve question no.5

Q5. The electronic configuration of gadolinium (Atomic number 64) is:

(a) [Xe] 4 ƒ3 5d5 6s2 (b) [Xe] 4 ƒ7 5d2 6s1

(c) [Xe] 4 ƒ7 5d1 6s2 (d) [Xe] 4ƒ8 5d6 6s2
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