Draw the figure to show the splitting of d-orbitals in an octahedral crystal field. How does the magnitude of `Delta_(0)` decide the actual configuration of d-orbitals in a coordination entity?
(i) Write IUPAC Name of the complen `[Co(en)_(3)]^(3+)`

Explanation

### Step-by-Step Text Solution

**Step 1: Draw the Splitting of d-Orbitals in an Octahedral Crystal Field**

In an octahedral crystal field, the five d-orbitals (dxy, dyz, dzx, dx²-y², dz²) split into two sets due to the presence of ligands around the central metal ion. The d-orbitals are split into:

- **t2g Orbitals**: These are lower in energy and consist of dxy, dyz, and dzx.
- **eg Orbitals**: These are higher in energy and consist of dx²-y² and dz².
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