The noble gas with the highest boiling point is :

Options

A. Xe
B. He
C. Ne
D. Kr

Answer

To determine the noble gas with the highest boiling point, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Noble Gases**: The noble gases include Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), and Radon (Rn).

2. **Identify the Boiling Points**: We need to know the boiling points of these noble gases:
- Helium (He): -268.9 °C
- Neon (Ne): -246.1 °C
- Argon (Ar): -185.8 °C
- Krypton (Kr): -157.4 °C
- Xenon (Xe): -108.1 °C
- Radon (Rn): -61.8 °C (Note: Radon is radioactive and less commonly discussed in this context)

3. **Compare the Boiling Points**: By comparing the boiling points of all the noble gases listed, we can see that:
- Helium has the lowest boiling point.
- Neon has a higher boiling point than Helium.
- Argon has a higher boiling point than Neon.
- Krypton has a higher boiling point than Argon.
- Xenon has a higher boiling point than Krypton.
- Radon has a higher boiling point than Xenon.

4. **Conclusion**: Among these noble gases, Xenon has the highest boiling point at -108.1 °C.

5. **Final Answer**: Therefore, the noble gas with the highest boiling point is **Xenon (Xe)**.