Astato

Ang astato (Iningles astatine) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga At ug kaiphan nga atomik 85. Ang astato mao ang halogen.

Astatine
85At
I ↑ At ↓ Uus Periodic table polonium ← astatine → radon
Panagway
unknown, but probably a black solid; possibly metallic in appearance
Kinatibuk-ang mga kinaiya
Ngalan, simbolo, kaiphan	astatine, At, 85
Paglitok	/ˈæstətiːn/ [[Help:Pronunciation respelling key|Plantilya:Smallcaps all-tə-teen]] or /ˈæstətɪn/ [[Help:Pronunciation respelling key|Plantilya:Smallcaps all-tə-tin]]
Kategoriyang elemento	halogen sometimes classified as a metalloid (disputed)
Group, period, block	17, 6, p
Gibug-aton sa atomo	(210)
Kontorno sa elektron	[Xe] 4f14 5d10 6s2 6p5 2, 8, 18, 32, 18, 7
History
Pagkadiskobre	Dale R. Corson, Kenneth Ross MacKenzie, Emilio Segrè (1940)
Physical properties
Phase	magahi
Melting point	575 K, 302 °C, 576 °F
Boiling point	610 K, 337 °C, 639 °F
Heat of vaporization	(At2) 54.39 kJ·mol−1
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	2.2 (Pauling scale)
Ionization energies	1st: 887.7±38.59 kJ·mol−1
Covalent radius	150 pm
Van der Waals radius	202 pm
Miscellanea
Magnetic ordering	no data
Thermal conductivity	1.7 W·m−1·K−1
CAS registry number	7440-68-8
Most stable isotopes
Main article: Isotopes of astatine
iso NA half-life DM DE (MeV) DP 209At syn 5.41 h β+ 3.486 209Po α 5.758 205Bi 210At syn 8.1 h β+ 3.981 210Po α 5.632 206Bi 211At syn 7.21 h ε 0.786 211Po α 5.983 207Bi
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