`[Cr(NH_3)_6]^(3+)` is paramagnetic while `[Ni(CN)_4]^(2-)` is diamagnetic. Explain why?

Explanation

To explain why `[Cr(NH_3)_6]^(3+)` is paramagnetic while `[Ni(CN)_4]^(2-)` is diamagnetic, we can follow these steps:

### Step 1: Determine the electronic configuration of Chromium in `[Cr(NH_3)_6]^(3+)`
- Chromium (Cr) has an atomic number of 24. Its ground state electronic configuration is:
\[ \text{Cr: } [Ar] 4s^1 3d^5 \]
- In the complex `[Cr(NH_3)_6]^{3+}`, chromium has a +3 oxidation state. This means we need to remove three electrons:
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