Statements (51)
| Predicate | Object |
|---|---|
| gptkbp:instance_of |
gptkb:chemical_compound
|
| gptkbp:bfsLayer |
5
|
| gptkbp:bfsParent |
gptkb:Mendeleev's_Periodic_Table
|
| gptkbp:availability |
very rare and expensive
|
| gptkbp:average_temperature |
gptkb:public_square
|
| gptkbp:category |
halogen
|
| gptkbp:color |
black or dark brown
|
| gptkbp:composed_of |
produced in particle accelerators
similar to iodine |
| gptkbp:contains_allergens |
none known
|
| gptkbp:cooling_system |
low
|
| gptkbp:diplomatic_relations |
used in targeted alpha-particle therapy
|
| gptkbp:discovered_by |
Emilio Segrè
|
| gptkbp:dissolved |
low
|
| gptkbp:ecological_role |
none known
|
| gptkbp:electronegativity |
2.2 (Pauling scale)
[ Xe] 4f14 5d10 6s2 6p5 |
| gptkbp:environmental_impact |
minimal due to rarity
|
| gptkbp:historical_significance |
one of the last naturally occurring elements discovered.
|
| https://www.w3.org/2000/01/rdf-schema#label |
astatine
|
| gptkbp:is_vulnerable_to |
paramagnetic
|
| gptkbp:isotopes |
gptkb:theorem
85 At-210 At-211 At-212 At-213 |
| gptkbp:lifespan |
1.5 hours (At-212)
25.1 minutes (At-213) 7.2 hours (At-211) 8.1 hours (At-210) |
| gptkbp:melting_point |
302 ° C
337 ° C |
| gptkbp:occurs_in |
trace amounts in nature
produced by the decay of uranium and thorium |
| gptkbp:population |
7.0 g/cm³
|
| gptkbp:power_output |
17.0 e V
26.0 e V 9.3 e V |
| gptkbp:safety_features |
highly radioactive and toxic
|
| gptkbp:social_structure |
cubic
-1, +1, +3, +5 |
| gptkbp:status |
limited due to scarcity and radioactivity
|
| gptkbp:symbol |
At
|
| gptkbp:uses |
radiotherapy
research in nuclear medicine |
| gptkbp:was_a_response_to |
reacts with halogens
can form compounds with hydrogen reacts with metals to form astatides |
| gptkbp:water_management |
requires special handling due to radioactivity
|
| gptkbp:year_created |
gptkb:1940
|