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.
Quick facts Astatine, Panagway ...
| Astatine |
|---|
85At |
|
|
| 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 |
|---|
| 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 |
|
| · r |
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