JEE Chemistry 2024 Question with Solution

Given: We must identify the option in which all listed elements have a completely filled $d$-subshell, i.e. $d^{10}$ configuration.

Find: The correct option containing only elements with $d^{10}$ electronic configuration.

From the solution, the relevant electronic configurations are:

$$\text{Cu} = [\text{Ar}]\,3d^{10}4s^1$$ $$\text{Zn} = [\text{Ar}]\,3d^{10}4s^2$$ $$\text{Ag} = [\text{Kr}]\,4d^{10}5s^1$$ $$\text{Cd} = [\text{Kr}]\,4d^{10}5s^2$$

Each of these species has a fully filled $d$-subshell with $10$ electrons.

Therefore, the set Cu, Zn, Ag, Cd has $d^{10}$ electronic configuration.

The correct option is B.

Given: The question asks which set of elements all possess a $d^{10}$ electronic configuration.

Find: Which option contains only elements having a completely filled $d$-subshell.

The solution evaluates the elements as follows:

1. $\text{Cu}$: electronic configuration is

$$[\text{Ar}]\,3d^{10}4s^1$$

so the $3d$ subshell is completely filled.

2. $\text{Zn}$: electronic configuration is

$$[\text{Ar}]\,3d^{10}4s^2$$

so the $3d$ subshell is completely filled.

3. $\text{Cd}$: electronic configuration is

$$[\text{Kr}]\,4d^{10}5s^2$$

so the $4d$ subshell is completely filled.

4. $\text{Ag}$: electronic configuration is

$$[\text{Kr}]\,4d^{10}5s^1$$

so the $4d$ subshell is completely filled.

Thus, all elements in option B possess $d^{10}$ configuration.

Therefore, the correct answer is B.