Symbol At
Atomic Number 85
Atomic Mass [210]
Discovered by Astatine was discovered by Dale R. Corson, Kenneth Ross MacKenzie, Emilio Segrè

What is Astatine?

  • 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.

Chemical Properties of Astatine

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 [210]
State at 20°C Solid Key isotopes 210At, 211At
Electron configuration [Xe] 4f15d16s6p5

Uses of Astatine

  • 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.
Test your knowledge on astatine!


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