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Astatine is a chemical element belonging to the halogen family. It is the heaviest halogen and is an analog of iodine.

Although astatine is a rare element, it is present in trace amounts in the earth’s crust. In fact, the Guinness Book of Records has listed it as the rarest natural element on Earth.

Astatine occurs naturally as a decay product of uranium. It is a halogen, and its atomic number is 85. There is only one stable isotope, astatine-210, which has a half-life of 8.1 hours.

Astatine is a very radioactive element, and its ionization energy is very high. CERN scientists measured this energy in 2013 at 9.31751 electron volts.

In addition to its radioactivity, Astatine also has some metallic characteristics. When combined with iodine, it acts as a carrier. This is how it was used in most experiments.

However, the majority of the scientific research into astatine has been conducted before the element’s disintegration. Due to its short half-life, the physical properties of the element are not known with certainty.

While many scientists have attempted to find a new element in nature, no one has yet succeeded. In 1869, Dmitri Mendeleev published the first periodic table. He predicted that there would be an element called eka-iodine. However, the new element was not found until 1940.

The atomic mass of astatine is calculated from the naturally occurring isotopes. It has a total atomic mass of 210 u.

At room temperature, astatine is a solid. However, it oxidises rapidly in air.

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