A completely filled d -orbital `(d^(10))` is

Options

A. Spherically symmetrical
B. Has octahedral symmetry
C. Has tetrahedral symmetry
D. Depends on the atom

Explanation

To determine the characteristics of a completely filled d-orbital (d^10), we can follow these steps:

### Step-by-Step Solution:

1. **Understanding d-Orbitals**:
- The d-orbitals are a set of five orbitals (dxy, dyz, dzx, dx²-y², dz²) that can hold a maximum of 10 electrons (2 electrons per orbital).

2. **Completely Filled d-Orbital**:
- A completely filled d-orbital means that all five d-orbitals are filled with a total of 10 electrons (d^10).

3. **Symmetry of d-Orbitals**:
- The shape of d-orbitals is more complex compared to s and p orbitals. However, when they are completely filled (d^10), they exhibit a specific symmetry.

4. **Spherical Symmetry**:
- A completely filled d-orbital (d^10) is considered to be spherically symmetrical. This means that the electron density is evenly distributed around the nucleus, resembling a sphere.

5. **Conclusion**:
- Therefore, the characteristic of a completely filled d-orbital (d^10) is that it is spherically symmetrical.

### Final Answer:
A completely filled d-orbital (d^10) is spherically symmetrical.

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