Question

Which of the following elements are not regarded as transition elements?

• A. Zn, Cd, Hg
• B. Cu, Zn, Hg
• C. Ag, Zn, Hg
• D. Ag, Cd, Hg

Hint:

d-block elements with full d-orbitals in all common oxidation states do not qualify as transition elements.

Answer 1

The Correct Option is A

Step 1: Definition of a transition element.
A transition metal must have an incomplete d-subshell either in the ground state or in any common oxidation state.

Step 2: Apply to Zn, Cd, Hg.
All three have completely filled d\(^{10}\) configuration in the ground state and in their stable +2 state. They never display a partially filled d-shell, so they are not transition metals.
\[ \boxed{Zn,\ Cd,\ Hg} \]