#85 Astatine

Astatine is a radioactive chemical element with symbol At and atomic number 85. Many of them have been estimated based on the element's position on the periodic table as a heavier analog of iodine, and a member of the halogens (the group of elements including fluorine, chlorine, bromine, and iodine).

Atomic mass:(210.0) amu

Melting point:302.0 C (575.15 K, 575.6 F)

Boiling point:337.0 C (610.15 K, 638.6 F)

Density:293 K:Unknown