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

Options

A. Gd
B. Hs
C. Es
D. Cs

Answer

B

Explanation

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)d^(1-10) ns^(1-2)`. Depending on `(n - 1)` values, there are `3d, 4d ,5d` and 6d series of transition elements. `Hs(Z = 108) belongs to 6d series ith electronic configuration - `[Rn]5f^14 6d^6 7s^2`.