The dand fblock elements - Result Question 72

####72. The electronic configurations of Eu( Atomic No. 63), Gd(Atomic No. 64) and Tb (Atomic No. 65) are

[2016]

(a) [Xe]4f76s2,[Xe]4f86s2 and [Xe]4f85d16s2

(b) [Xe]4f75d16s2,[Xe]4f75d16s2 and [Xe]4f96s2

(c) [Xe]4f65d16s2,[Xe]4f75d16s2 and [Xe]4f85d16s2

(d) [Xe]4f76s2,[Xe]4f75d16s2 and [Xe]4f96s2

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Solution:

  1. (d) Eu(63)=[Xe]4f76s2

Gd(64)=[Xe]4f75d16s2

Tb(65)=[Xe]4f96s2



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