astatine — At
The chemical element astatine is an element of type Metalloids with the symbol At. It has an atomic mass of 210 u and an electronic configuration of [Xe] 4f14 5d10 6s2 6p5.
Synthétique
Radioactif
Liquide
Gaz
- Atomic number
- 85
- Atomic mass
- 210
- Symbol
- At
- Melting point
- 302
- Boiling point
- 337
- Density
- 7
- Period
- 6
- Group
- 17
- Discovery
- 1940 Corson et al.
- Abundance
- 0.001
- Radius
- 1.4
- Electronegativity
- 2.2
- Ionization
- 9.3
- Isotope
- 21
- Electronic configuration
- [Xe] 4f14 5d10 6s2 6p5
- Oxidation state
- -1,1,3,5
- Electron
- 2,8,18,32,18,7