Astatine is a very rare and radioactive element, making it difficult to study and determine its properties accurately.

Here's what we know:

* Melting point: Estimated to be around 302 °C (575 °F). This value is based on extrapolations from trends in the periodic table.

* Boiling point: Estimated to be around 337 °C (639 °F). Similar to the melting point, this is an extrapolated value.

Important Note: These values are estimations and should be treated with caution due to the limited experimental data available for astatine.