|Group||17||Melting point||300°C, 572°F, 573 K|
|Period||6||Boiling point||350°C, 662°F, 623 K|
|Block||p||Density (g cm−3)||Unknown|
|Atomic number||85||Relative atomic mass|||
|State at 20°C||Solid||Key isotopes||210At, 211At|
|Electron configuration||[Xe] 4f14 5d10 6s2 6p5||CAS number||7440-68-8|
|ChemSpider ID||4573995||ChemSpider is a free chemical database|
- Astatine is the 85th element of the periodic table with a symbol ‘At’.
- It is a radioactive element and is said to be the most heavier among the halogens. This element exhibits similar chemical properties that of the element iodine.
- The isotopes of astatine have a short life of about 8.1 hours, and some isotopes are said to be unstable. It has about seven isotopes. This element appears as a black solid with a metallic look.
- It is considered as one of the rarest occurring natural element. About 2.36 × 1025 grams of the earth’s crust comprises of astatine which measures about lesser than 1 gram. Astatine is mainly formed by the decay of thorium and uranium.
- As astatine behaves similarly as iodine, it gets secreted in the thyroid gland. Hence it is used for treating diseases related to the thyroid.
- The isotope called Astatine-211 is utilized in the process of radiotherapy. It is also employed in the treatment of cancer as it is known to destroy cancer-causing cells.