Template:Infobox astatine

Astatine, ₈₅At

Astatine
Pronunciation	/ˈæstətiːn, -tɪn/ ​(AS-tə-teen, -tin)
Appearance	unkent, but probably metallic
Mass number	[210]
Astatine in the periodic cairt
Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Airn Cobalt Nickel Capper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Siller (element) Cadmium Indium Tin Antimony Tellurium Iodine Xenon Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gowd Mercur (element) Thallium Leid (element) Bismuth Polonium Astatine Radon Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Ununtrium Flerovium Ununpentium Livermorium Ununseptium Ununoctium I ↑ At ↓ Uus polonium ← astatine → radon
Atomic nummer (Z)	85
Group	group 17 (halogens)
Period	period 6
Block	p-block
Element category	Metalloid
Electron confeeguration	[Xe] 4f14 5d10 6s2 6p5
Electrons per shell	2, 8, 18, 32, 18, 7
Pheesical properties
Phase at STP	solit
Meltin pynt	575 K ​(302 °C, ​576 °F)
Bylin pynt	610 K ​(337 °C, ​639 °F)
Density (near r.t.)	(At2) 6.2–6.5 (predictit) g/cm3
Heat o vapourisation	(At2) 54.39 kJ/mol
Vapour pressur P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 361 392 429 475 531 607
Atomic properties
Oxidation states	−1, +1, +3, +5, +7
Electronegativity	Pauling scale: 2.2
Covalent radius	150 pm
Van der Waals radius	202 pm
Ither properties
Thermal conductivity	1.7 W/(m·K)
CAS Nummer	7440-68-8
History
Diskivery	Dale R. Corson, Kenneth Ross MacKenzie, Emilio Segrè (1940)
Main isotopes o astatine
Iso­tope Abun­dance Hauf-life (t1/2) Decay mode Pro­duct 209At syn 5.41 h β+ 209Po α 205Bi 210At syn 8.1 h β+ 210Po α 206Bi 211At syn 7.21 h ε 211Po α 207Bi

style="text-align:left"| data m.p. cat
	in	calc from C	diff	report	ref
C	302	—	—
K	575	575	0
F	576	576	0
WD	!
input	C: 302, K: 575, F: 576
comment

style="text-align:left"| data b.p. cat
	in	calc from C	diff	report	ref
C	337	—	—
K	610	610	0
F	639	639	0
WD	503 !503 kelvin
input	C: 337, K: 610, F: 639
comment

References

Thir references will appear in the airticle, but this list appears anerly on this page.