Which is the most stable element?

Explanation

To determine the most stable element, we need to consider two different aspects of stability: elemental stability and nuclear stability.

### Step-by-Step Solution:

1. **Understanding Elemental Stability**:
- Elemental stability refers to how stable an element is in its natural, elemental form. Some elements are more stable and do not readily react with other elements.

2. **Identifying the Most Stable Element in Elemental Form**:
- Among the elements, Tellurium (Te) is noted for being stable in its elemental form. This means that Tellurium can exist without readily reacting with other elements, making it one of the most stable elements in this regard.

3. **Understanding Nuclear Stability**:
- Nuclear stability refers to the stability of an element's nucleus. This is often measured by the binding energy per nucleon, which indicates how tightly the nucleons (protons and neutrons) are held together in the nucleus.

4. **Identifying the Most Stable Element in Terms of Nuclear Stability**:
- Iron (Fe) is recognized as the most stable element when considering nuclear stability. It has the highest binding energy per nucleon, which is approximately 8.37 MeV (million electron volts). This high value indicates that the nucleus of iron is very stable.

5. **Conclusion**:
- Therefore, when asked about the most stable element, we can conclude that:
- For elemental stability, Tellurium (Te) is the most stable.
- For nuclear stability, Iron (Fe) is the most stable.

### Final Answer:
- The most stable element in terms of elemental form is Tellurium (Te), while in terms of nuclear stability, it is Iron (Fe).