Number of unpaired d-electrons with Z = 25 are:
Correct answer: B. 5
- A. 4
- B. 5
- C. 6
- D. 7
Explanation
To determine the number of unpaired d-electrons for an element with atomic number Z = 25, consider its electronic configuration. Atomic number 25 corresponds to the element manganese (Mn).The electron configuration for manganese (Mn) is: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁵To find the number of unpaired d-electrons, look at the 3d subshell, which contains 5 electrons: ↑ ↑ ↑ ↑ ↑ There are five unpaired d-electrons (↑), so the number of unpaired d-electrons for manganese (Z = 25) is 5.
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