Question

Total number of unpaired electrons in d-orbitals of an atom of element of atomic number 29 is:

• A. 10
• B. 1
• C. 0
• D. 5

Answer 1

The correct option is C 0

Electronic configuration of the element with atomic number 29 is $\left[Ar\right]{3d}^{10}{4s}^1$. Filled energy level or shell makes element chemically inert like noble gases. Thus, when 3d-orbital is completely filled with 10 electrons (its maximum capacity), it is more stable. And it has no unpaired electrons in d-orbital as shown in the diagram.