Which of the following noble gases do not reasct with function

Options

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

Explanation

To determine which noble gases do not react, we will analyze the properties of the given noble gases: Krypton, Xenon, Helium, and Neon.

### Step-by-Step Solution:

1. **Identify the Noble Gases**:
The noble gases in question are:
- Helium (He)
- Neon (Ne)
- Krypton (Kr)
- Xenon (Xe)

2. **Understand the Reactivity of Noble Gases**:
Noble gases are known for their lack of reactivity due to their complete valence electron shells. However, some noble gases can react under certain conditions.

3. **Consider Ionization Energy**:
- Ionization energy (IE) is the energy required to remove an electron from an atom.
- As we move down the group of noble gases in the periodic table, the ionization energy decreases.

4. **Compare Ionization Energies**:
- Helium has the highest ionization energy.
- Neon has a high ionization energy, but lower than Helium.
- Krypton has a lower ionization energy than Neon.
- Xenon has the lowest ionization energy among the four.

5. **Determine Reactivity**:
- Helium and Neon, having high ionization energies, are generally unreactive and do not form compounds under normal conditions.
- Krypton and Xenon, with lower ionization energies, can react under specific conditions, such as in the presence of strong oxidizing agents.

6. **Conclusion**:
The noble gases that do not react are **Helium and Neon**.

### Final Answer:
Helium and Neon do not react.