మూస:Infobox astatine

ఆస్టాటైన్, ₀₀At

ఆస్టాటైన్
Pronunciation	/ˈæstətiːn, -tɪn/ ​(ASS-tə-teen-,_--tin)
Appearance	unknown, but probably metallic
ఆస్టాటైన్ in the periodic table
Group	group 17 (halogens)
Period	period 6
Block
Electrons per shell	2, 8, 18, 32, 18, 7
Physical properties
Phase at STP	solid
Melting point	575 K ​(302 °C, ​576 °F)
Boiling point	610 K ​(337 °C, ​639 °F)
Density (near r.t.)	(At2) 6.2–6.5 (predicted) g/cm3
Heat of vaporization	(At2) 54.39 kJ/mol
Vapor pressure 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
Other properties
Natural occurrence	from decay
Thermal conductivity	1.7 W/(m⋅K)
CAS Number	7440-68-8
History
Discovery	Dale R. Corson, Kenneth Ross MacKenzie, Emilio Segrè (1940)
Isotopes of ఆస్టాటైన్

References

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