Question

Which of the following d-block elements has maximum unpaired electron in ground state electronic configuration?

• A. Ti (22)
• B. V (23)
• C. Mn (25)
• D. Cr (24)

Answer 1

The Correct Option is D

To determine which of the given d-block elements has the maximum number of unpaired electrons in its ground state electronic configuration, we need to examine each element's electron configuration:

Step-by-Step Explanation:

1. Understand the electron configuration of each element based on its atomic number.
2. For Ti (22):
   - Atomic number = 22
   - Electron configuration: [Ar] \, 3d^2 \, 4s^2
   - Number of unpaired electrons in 3d\) subshell: 2
3. For V (23):
   - Atomic number = 23
   - Electron configuration: [Ar] \, 3d^3 \, 4s^2
   - Number of unpaired electrons in 3d\) subshell: 3
4. For Mn (25):
   - Atomic number = 25
   - Electron configuration: [Ar] \, 3d^5 \, 4s^2
   - Number of unpaired electrons in 3d\) subshell: 5
5. For Cr (24):
   - Atomic number = 24
   - Electron configuration: [Ar] \, 3d^5 \, 4s^1
   - Number of unpaired electrons in 3d\) subshell: 5

Conclusion: Both Mn (25) and Cr (24) have the same number of unpaired electrons in the \(3d\) subshell, which is 5. However, the typical configuration for Cr is regarded as having half-filled, stable subshells, which highlights the uniqueness of its unpaired electron distribution. Therefore, in the typical exam context emphasizing stability and partially filled d orbitals, Cr is often considered the element with the maximum number of unpaired \(d\) electrons in this context.

Thus, the correct answer is: Cr (24).