Astatine


 * Element Name:** Astatine


 * Element symbol:** At


 * Atomic Mass:** 210


 * Atomic Number:** 85
 * Protons:** 85


 * Electrons:** 85


 * Discovery:** Fred Allison and associates in 1931


 * How it was named:** From the Greek word for Unstable,astatos


 * State of matter:** solid


 * Melting point in °C:** 302°C


 * Boiling point in °C:** Unknown


 * Characteristics:** A nearly black solid, highly raidoactive, and the halogens get darker in color with increasing molecular weight and atomic number.


 * Uses:** Due to the small amounts produced and its short half-life, there are currently no uses for astatine outside of basic scientific research.


 * Interesting Facts:** There is only about 7 grams per cubic centimeter and heating the bismuth target to 300-600°C under N2 results in a stream of the elemental astatine that can be collectedon a cold glass finger.

media type="youtube" key="sSL7EwdlLlE?fs=1" height="307" width="384" align="center"