Statements (50)
| Predicate | Object |
|---|---|
| gptkbp:instance_of |
gptkb:isotope
|
| gptkbp:bfsLayer |
7
|
| gptkbp:bfsParent |
gptkb:Fr-223
|
| gptkbp:application |
used in scientific research
used in radiation therapy for cancer treatment |
| gptkbp:class |
alkaline earth metals
|
| gptkbp:color |
silvery-white
|
| gptkbp:combatants |
7.6 Me V
|
| gptkbp:composed_of |
alkaline earth metal
synthesized in laboratories. |
| gptkbp:cooling_system |
0.12 W/m· K
|
| gptkbp:discovered_by |
gptkb:Frederick_Soddy
|
| gptkbp:dissolved |
insoluble in water
|
| gptkbp:electronegativity |
not applicable
[ Rn] 7s2 |
| gptkbp:environmental_impact |
highly radioactive
can contaminate water sources |
| gptkbp:historical_significance |
first isolated in 1920
|
| https://www.w3.org/2000/01/rdf-schema#label |
Ra-227
|
| gptkbp:is_part_of |
actinide series
|
| gptkbp:isotopes |
gptkb:Radium
139 88 unstable isotope 227.0311 u not used in fission reactors produces Rn-223 and other isotopes very low in nature |
| gptkbp:lifespan |
15.7 days
|
| gptkbp:melting_point |
1413 ° C
1000 ° C |
| gptkbp:mode |
alpha decay
|
| gptkbp:occurs_in |
trace amounts in uranium ores
|
| gptkbp:parent |
gptkb:Ac-227
Rn-223 |
| gptkbp:population |
5.5 g/cm³
|
| gptkbp:power_output |
5.27 e V
|
| gptkbp:produced_by |
extraction from uranium ore
|
| gptkbp:regulatory_compliance |
regulated by nuclear safety authorities
|
| gptkbp:roll_rate |
3/2
|
| gptkbp:safety_features |
requires shielding due to radioactivity
|
| gptkbp:social_responsibility |
exposure can lead to cancer
|
| gptkbp:social_structure |
face-centered cubic
+2, +4 |
| gptkbp:storage |
must be stored in lead-lined containers
|
| gptkbp:symbol |
gptkb:Ra
|
| gptkbp:uses |
radiotherapy
|
| gptkbp:was_a_response_to |
produced in neutron capture reactions
reacts with air and moisture |
| gptkbp:year_created |
gptkb:1920
|