Question

Which of the following element is not a transition element?

• A. Fe
• B. Mn
• C. Zn
• D. Ag

Answer 1

The correct option is C Zn

Metals that have incomplete d subshell either in neutral atom ​
or in their ions known as transition metals​.
Zinc has the electronic configuration $\left[Ar\right]3d^{10}4s^2$.and the configuration of the $Z{n}^{2+}$ ion is $\left[Ar\right]3d^{10}.$ Thus, Zn is a non-transition metal.
Also, Cd, Hg of group 12 have full $d^{10}$ configuration in their ground state as well as in their common oxidation states.​ Thus, both are non-transition metal.
Note: All transition elements are d-block elements, but all d-block elements are not transition elements.