| Formula / Notation | At |
|---|---|
| CAS Number | 7440-68-8 |
| Molecular Weight | 210.0 |
| Melting Point | 302.0 |
| Boiling Point | 337.0 |
| Density | 7.0 |
| Solubility | Unknown (estimated) |
| Appearance | Believed to be metallic or metalloid solid; radioactive |
| Also Known As | At, astatine element |
| Category | Elements |
What is Astatine?
Astatine is a radioactive halogen, atomic number 85. The rarest naturally occurring element in Earth crust (total amount ~31 grams at any time). All isotopes are short-lived. At-211 is being investigated for targeted alpha therapy in cancer treatment.
Formula & Notation
IUPAC Name: Astatine
Other Names / Synonyms: At, astatine element
Properties & Characteristics
Physical Data
| Property | Value |
|---|---|
| Melting Point | 302.0 |
| Boiling Point | 337.0 |
| Density | 7.0 |
| Molecular Weight | 210.0 |
| Solubility | Unknown (estimated) |
| Appearance | Believed to be metallic or metalloid solid; radioactive |
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
Astatine is a radioactive halogen, atomic number 85. The rarest naturally occurring element in Earth crust (total amount ~31 grams at any time). All isotopes are short-lived. At-211 is being investigated for targeted alpha therapy in cancer treatment.
At-211 targeted alpha radiotherapy (cancer treatment - labelled antibodies and peptides). Research into astatine chemistry. Production in cyclotrons from bismuth targets. At-211 in thyroid cancer treatment trials.
Extremely radioactive - all isotopes short-lived. Production only in microgram quantities in particle accelerators. Alpha emitter - internal contamination extremely hazardous. Handle with microchemical techniques and appropriate radiation shielding.
The formula or notation for Astatine is: At