Astatine (At) — Halogen. Atomic number 85.
Dark radioactive solid
- Atomic number: 85
- Symbol: At
- Atomic mass: [210] u
- Category: Halogen
- State: Solid
- Melting point: 301.85 °C / 575 K
- Boiling point: 336.85 °C / 610 K
- Density: 7 g/cm³ (20°C)
- Electron configuration: [Xe] 4f14 5d10 6s2 6p5
- Oxidation states: −1, +1, +3, +5, +7
- Electronegativity: 2.2
- Discovered by: Dale Corson, Kenneth MacKenzie, Emilio Segrè (1940)
Common uses: Cancer research, Radiotherapy research
Biological role: No biological role.
Frequently Asked Questions about Astatine
What is the atomic number of astatine?
Astatine has an atomic number of 85, meaning each atom contains 85 protons in its nucleus.
What is the atomic mass of astatine?
The standard atomic weight of astatine is [210] u (unified atomic mass units).
What category does astatine belong to?
Astatine is classified as a halogen.
What is the state of astatine at room temperature?
Astatine is a solid at 20 °C (68 °F).
What is the melting point of astatine?
The melting point of astatine is 301.85 °C / 575 K.
What is the boiling point of astatine?
The boiling point of astatine is 336.85 °C / 610 K.
What is the density of astatine?
The density of astatine is 7 g/cm³ (20°C).
What is the electronegativity of astatine?
Astatine has a Pauling electronegativity of 2.2.
What is the electron configuration of astatine?
The electron configuration of astatine is [Xe] 4f14 5d10 6s2 6p5.
What are the common oxidation states of astatine?
Astatine commonly exhibits the following oxidation states: −1, +1, +3, +5, +7.
When was astatine discovered?
Astatine was discovered in 1940 by Dale Corson, Kenneth MacKenzie, Emilio Segrè.
Is astatine radioactive?
Astatine is a naturally occurring radioactive element; all of its isotopes are radioactive.
What is the biological role of astatine?
No biological role.
What are the common uses of astatine?
Astatine is used for: Cancer research; Radiotherapy research.
