Why Xe forms more compounds than Kr?

Explanation

### Step-by-Step Solution:

1. **Understanding Noble Gases**: Noble gases, including xenon (Xe) and krypton (Kr), are known for their lack of reactivity due to their complete valence electron shells. However, xenon is unique among the noble gases because it can form compounds.

2. **Electron Configuration**: Xenon has the electron configuration of [Kr] 5s² 5p⁶, while krypton has [Ar] 4s² 4p⁶. As we move down the group in the periodic table, the atomic size increases. This means that the valence electrons in xenon are further from the nucleus compared to those in krypton.

3. **Loosely Held Electrons**: The larger size of xenon results in its valence electrons being held less tightly by the nucleus compared to krypton. This makes xenon more susceptible to oxidation and allows it to participate in chemical reactions with highly electronegative elements like fluorine and oxygen.

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