Electronic data		Thermal data		Steric data
Shells: 2,8,18,32,18,7 Orbitals: [Xe] 4f14 5d10 6s2 6p5 Electronegativity: 2.0, 2.2 1. Ionization potential: 9.5 eV 2. Ionization potential: -- eV 3. Ionization potential: -- eV Oxidation states: 7,5,3,1,-1 Electrical conductivity: --		Melting point: 302 °C Boiling point: 337 °C Specific heat: -- J/gK Heat of fusion: -- kJ/mol Heat of vaporization: -- kJ/mol Thermal conductivity: 0.017 W/cmK		Atomic radius: 1.43 Å Ionic radius: -- Å () Covalent radius: 1.45 Å Atomic volume: -- cm³/mol Density (293 K): -- g/cm³ Crystal structure: --

Nuclide	Abundance [%]	Mass	Spin	Halflife	Decay mode	Decay tree
206At	0	206	5	29.4m	EC,+,	View
208At	0	208	6	1.63h	EC,+,	View
211At	0	210.988	9/2	7.21h	EC,	View
215At	0	214.999	9/2	0.10ms		View
217At	0	217.005	9/2	32ms	,-	View
218At	0	218.009	0	1.6s		View
219At	0	219.011	0	50s	,-	View

Legend

Name origin:	Greek: astatos (unstable).
Description:	Unstable, radioactive member of the halogen group.
Discovered by:	D.R.Corson, K.R.MacKenzie, E.Segré
Year:	1940
Place:	United States
Sources:	Does not occur in nature. Similar to iodine. Produced by bombarding bismuth with alpha particles.
Use(s):	Since its isotopes have such short half-lives there are no commercially significant compounds of astatine.