Write the electronic configurations and predict the number of unpaired electrons in the following :
(i) `Cr (Z = 24)`
(ii) `Fe(Z = 26)`

Explanation

To solve the question, we will write the electronic configurations of Chromium (Cr) and Iron (Fe) and then determine the number of unpaired electrons for each element.

### Step 1: Write the electronic configuration for Chromium (Cr, Z = 24)

1. **Determine the order of filling orbitals**: The order of filling is based on the Aufbau principle, which states that electrons occupy the lowest energy orbitals first. The order is as follows: 1s, 2s, 2p, 3s, 3p, 4s, 3d.

2. **Fill the orbitals with electrons**:
- 1s can hold 2 electrons: 1s²
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