General Knowledge - Chemistry - Discussion

The electron configurations are as follows:

1. **Fe²⁺ (Z = 26):** [Ar] 3d⁶.
=> The number of d-electrons is 6.

2. **Ne (Z = 10):** 1s² 2s² 2p⁶
=> There are no p-electrons in Ne.

3. **Mg (Z = 12):** 1s² 2s² 2p⁶ 3s²
=> The number of s-electrons is 2.

4. **Fe (Z = 26):** [Ar] 4s² 3d⁶
=> The number of d-electrons is 6.

5. **Cl (Z = 17):** 1s² 2s² 2p⁶ 3s² 3p⁵
=> The number of p-electrons is 5.

In summary:

- The number of d-electrons in Fe²⁺ (Z = 26) is **6**.
- The number of p-electrons in Ne (Z = 10) is **0**.
- The number of s-electrons in Mg (Z = 12) is **2**.
- The number of d-electrons in Fe (Z = 26) is **6**.
- The number of p-electrons in Cl (Z = 17) is **5**.

Therefore, the statement is correct.

The number of d-electrons in Fe²⁺ is not equal to the specified electron counts in Ne, Mg, Fe, and Cl.

For 26= 1s2,2s2,2p6,3s2,3p6,4s2,3d6.
So d electron = 6.
For 10 = 1s2,2s2,2p6. So p electron = 6
For 12 = 1s2,2s2,2p6,3s2. So s electron = 6
And for 17= 1s2,2s2,2p6,3s2,3p5. So p electron = 11
So option d is different.