Why does chromium have configuration of type `3d^(5) 4s^(1)` instead of `3d^(4) 4s^(2)` ?

Explanation

To understand why chromium has the electron configuration of `3d^(5) 4s^(1)` instead of `3d^(4) 4s^(2)`, we can break down the reasoning into a step-by-step explanation.

### Step-by-Step Solution:

1. **Understanding Electron Configuration**:
- The electron configuration describes the distribution of electrons in atomic orbitals. For chromium, we are looking at the 3d and 4s orbitals.

2. **Expected Configuration**:
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