A) Gd
B) Hs
C) Es
D) Cs
Correct Answer: B
Solution :
The element in which last electron enters in d-orbital is called d-block element. The electronic configuration of the given elements are as follows \[Gd(64)=[Xe]\,6{{s}^{2}},4{{f}^{7}},5\,{{d}^{1}}\] \[Hs(108)=[Rn]\,7{{s}^{2}},5{{f}^{14}},6{{d}^{6}}\] \[Es(99)=[Rn]\,7{{s}^{2}},5{{f}^{11}}\] \[Cs(55)=[Xe]\,6{{s}^{1}}\] Thus, Hs is a d-block element.
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