Which of the following is/are not considered as transition elements?
Ag, Mo, Zn, Hg, W
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Hg and Zn
A transition element must have a partially filled d-subshell in its atom or in one of its common oxidation states.
- Ag: forms $Ag^{2+}$ ($d^9$) $\rightarrow$ partially filled $\rightarrow$ transition element.
- Mo: has partially filled d-subshell $\rightarrow$ transition element.
- W: partially filled d-subshell $\rightarrow$ transition element.
- Zn: $Zn^{2+}$ is $3d^{10}$ (completely filled) $\rightarrow$ not a transition element.
- Hg: $Hg^{2+}$ is $5d^{10}$ (completely filled) $\rightarrow$ not a transition element.
Therefore, the elements not considered transition elements are Hg and Zn.