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Astato .
Astatine
85 At
Panagway
unknown, but probably a black solid; possibly metallic in appearance
Kinatibuk-ang mga kinaiya
Ngalan, simbolo, kaiphan
astatine, At, 85
Paglitok
[[Help:Pronunciation respelling key|Plantilya:Smallcaps all -tə-teen ]] or [[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
Electron shells of astatine (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
209 At
syn
5.41 h
β+
3.486
209 Po
α
5.758
205 Bi
210 At
syn
8.1 h
β+
3.981
210 Po
α
5.632
206 Bi
211 At
syn
7.21 h
ε
0.786
211 Po
α
5.983
207 Bi
· r
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.
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