Here's why:

* Xenon's Melting Point: Xenon has a melting point of -111.8 °C (-171.2 °F). This means that at 0 °C, Xenon would be a solid, not a liquid.

* Xenon's Boiling Point: Xenon's boiling point is -108.1 °C (-162.6 °F). This means that at 0 °C, Xenon would still be a gas.

To have Xenon exist as a liquid, the temperature would need to be between its melting point and boiling point (-111.8 °C to -108.1 °C).