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Which one of the following is a 'd - block element '

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a
Gd
b
Hs
c
Es
d
Cs

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detailed solution

Correct option is B

d- block elements have incompletely filled d- orbitals in their ground state or in any of their oxidation states. The general electronic configuration of d - block elements is (n−1)d1−10ns1−2 Depending on (n -1) values, there are 3d,4d,5d and 6d series of transition elements. Hs(Z = 108) [Hassium] belongs to 6d series with electronic configuration - [Rn]5f146d67s2.

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