85Solid
At 210 Atomic mass · uHalogens
Astatine
Astatine is a very rare radioactive chemical element with the chemical symbol At and atomic number 85. It occurs on Earth as the decay product of various heavier elements. All its isotopes are short-lived; the most stable is astatine-210, with a half-life of 8.1 hours.
Discovery 1940 (Dale R. Corson)
K2L8M18N32O18P7
Physical properties
Values for the element in its standard state.
- Density
- Not available
- Melting point
- 575K
- Boiling point
- Not available
- Atomic radius
- Not available
- Bonding type
- Covalent network
- Molar heat
- Not available
Inside the atom
Electron arrangement and the energy behind its behavior.
Full electron configuration
1s, 2 electrons; 2s, 2 electrons; 2p, 6 electrons; 3s, 2 electrons; 3p, 6 electrons; 3d, 10 electrons; 4s, 2 electrons; 4p, 6 electrons; 4d, 10 electrons; 5s, 2 electrons; 5p, 6 electrons; 4f, 14 electrons; 5d, 10 electrons; 6s, 2 electrons; 6p, 5 electrons;
[Xe] represents 54 core electrons. The full view shows them explicitly.
85 electrons Orbital order preserved from source
- Electronegativity
- 2.2Pauling scale
- First ionization energy
- 920kJ/mol
- Electron affinity
- 270kJ/mol
- Van der Waals radius
- Not available
At AstatineAtomic number 85
920kJ/mol
Atomic numberGaps indicate unavailable data
About astatine
- Appearance
- Unknown, probably metallic
- Discovery
- 1940 (Dale R. Corson)
- Data source
- Read the reference
A missing value means it is unavailable in this reference dataset. Values can vary with measurement method and conditions.