Astatine is a very rare radioactive halogen studied in trace quantities, including for targeted alpha therapy research.
Atomic number
85
Category
Halogen
Period
6
Group
17
State
Solid
Fun facts about Astatine
All known astatine isotopes are radioactive.
Only minute transient amounts occur naturally in decay chains.
Its chemistry combines halogen behaviour with increasing metallic character.
Common uses of Astatine
Targeted alpha-therapy research
Fundamental chemical research
Where Astatine sits in the periodic table
Astatine is classified as a halogen in period 6 and group 17 of the periodic table. Under the conditions represented in this reference, its state is solid.
Quick chemistry revision
For quick revision, pair the symbol At with atomic number 85 and the listed atomic mass [210]. The summary, facts, and uses above keep those element properties together in one reference.