write two characteristic properties of nuclear force.

Explanation

**Step-by-Step Solution:**

1. **Identify the Nature of Nuclear Forces:**
- Nuclear forces are primarily responsible for holding the protons and neutrons together in the nucleus of an atom.

2. **Characteristic Property 1: Short-Range Attractive Forces**
- Nuclear forces are short-range forces, meaning they only act over a very limited distance. The effective range of nuclear forces is approximately \(10^{-15}\) meters (1 femtometer).
- Additionally, these forces are attractive, which means they pull nucleons (protons and neutrons) towards each other, helping to overcome the repulsive electromagnetic forces between protons.
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