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Q.
Which one of the following is $ 'd'- $ block element?
J & K CETJ & K CET 2009The d-and f-Block Elements
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
$G d(64)=[X e] 6 s^{2}, 4 f^{7}, 5 d^{1} $
$H s(108)=[R n] 7 s^{2}, 5 f^{14}, 6 d^{6} $
$E s(99)=[R n] 7 s^{2}, 5 f^{11}$
$C s(55)=[X e] 6 s^{1}$
Thus, $Hs$ is a $d$-block element