Surface tension is an atomic/molecular property of

Options

A. Atoms in the interior
B. Atoms at surface
C. Atoms which are exterior
D. Atoms at surface bounded entirely by different atoms

Explanation

To solve the question "Surface tension is an atomic/molecular property of", we need to analyze the options provided and understand the concept of surface tension in liquids.

### Step-by-Step Solution:

1. **Understanding Surface Tension**:
- Surface tension is a property of liquids that arises due to the cohesive forces between liquid molecules. These forces are stronger at the surface because the molecules at the surface are not surrounded by similar molecules on all sides.

2. **Analyzing the Options**:
- **Option 1: Atoms in the interior**: This option is incorrect because the molecules in the interior of a liquid experience equal forces from all sides, resulting in no net force and thus no surface tension.
- **Option 2: Atoms at the surface**: This option is correct as the molecules at the surface are subjected to unequal forces. They are pulled inward by the molecules below them but not by any air molecules above, leading to surface tension.
- **Option 3: Atoms which are exteriors**: This option is misleading. While exterior atoms may interact with the liquid, they do not directly contribute to the surface tension of the liquid itself.
- **Option 4: Atoms at surface bounded entirely by different atoms**: This option is also correct. The surface molecules are surrounded by liquid molecules below and air molecules above, creating a net inward force which contributes to surface tension.

3. **Conclusion**:
- The correct answer to the question is **Option 2** and **Option 4**. Surface tension is primarily a property of the atoms at the surface of the liquid, particularly those that are bounded by different atoms (air molecules).

### Final Answer:
Surface tension is an atomic/molecular property of **atoms at the surface** (Option 2) and **atoms at surface bounded entirely by different atoms** (Option 4).

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