Give reason for the following
Chromium is typical hard metal while mercury is a liquid.

Explanation

To explain why chromium is a typical hard metal while mercury is a liquid, we can analyze their electron configurations and the resulting metallic bonding characteristics.

### Step-by-Step Solution:

1. **Electron Configuration**:
- Chromium (Cr) has the electron configuration of [Ar] 3d^5 4s^1. This means it has 5 unpaired electrons in the d-orbitals and 1 unpaired electron in the s-orbital.
- Mercury (Hg) has the electron configuration of [Xe] 4f^14 5d^10 6s^2. In this case, all the d and s orbitals are fully filled, resulting in no unpaired electrons.

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