Question

Where does the last electron of d-block element go?

(a) nd

(b) (n-1)d

(c) np

(d) (n-1)s

I had been asked this question in an internship interview.

I'm obligated to ask this question of Electronic Configurations of the D-Block Elements topic in section D and F-Block Elements of Chemistry – Class 12

Answer 1

Right option is (b) (n-1)d

Explanation: In these elements, the last electron enters the d orbital of the penultimate shell, i.e., the last electron goes to (n-1) d orbital. Hence, these elements are named as d-block elements. These elements have partly filled d-subshells in their elementary form or in their simple ions.