`O_2` molecule is paramagnetic in nature.

Explanation

To understand why the O₂ molecule is paramagnetic in nature, we will analyze its electronic configuration using molecular orbital theory step-by-step.

### Step-by-Step Solution:

1. **Determine the Total Number of Electrons in O₂:**
- Each oxygen atom has 8 electrons (configuration: 1s² 2s² 2p⁴).
- Since there are two oxygen atoms in O₂, the total number of electrons is:
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