In the following metals which one has lowest probable inter-atomic forces ?

Options

A. Copper
B. Silver
C. Zinc
D. Mercury

Answer

To determine which of the given metals has the lowest probable inter-atomic forces, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Metals**: The metals provided in the question are copper (Cu), silver (Ag), zinc (Zn), and mercury (Hg).

2. **State the Physical States**:
- Copper (Cu) is a solid at room temperature.
- Silver (Ag) is also a solid at room temperature.
- Zinc (Zn) is a solid at room temperature.
- Mercury (Hg) is unique as it is a liquid at room temperature.

3. **Understand Inter-Atomic Forces**: Inter-atomic forces are the forces that hold atoms together in a solid or liquid. In solids, these forces are generally stronger due to the close packing of atoms, while in liquids, the forces are weaker because the atoms are not as closely packed.

4. **Compare the States of Matter**: Since mercury is the only liquid among the four metals, it will have weaker inter-atomic forces compared to the solid metals (copper, silver, and zinc).

5. **Conclusion**: Therefore, the metal with the lowest probable inter-atomic forces is mercury (Hg), as it is a liquid and has weaker forces compared to the solid metals.

### Final Answer:
The metal with the lowest probable inter-atomic forces is **mercury (Hg)**.

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