|
gptkbp:instance_of
|
gptkb:chemical_compound
|
|
gptkbp:bfsLayer
|
6
|
|
gptkbp:bfsParent
|
gptkb:Periodic_Table_of_Elements
gptkb:Alkali_Metals
|
|
gptkbp:application
|
nuclear physics
radiochemistry
atomic structure studies
|
|
gptkbp:availability
|
not commercially available
|
|
gptkbp:average_temperature
|
gptkb:public_square
|
|
gptkbp:base
|
soluble
|
|
gptkbp:category
|
alkali metal
|
|
gptkbp:color
|
gptkb:unknown
silvery-white
|
|
gptkbp:composed_of
|
highly reactive
|
|
gptkbp:discovered_by
|
gptkb:Marguerite_Perey
gptkb:Institut_du_Radium,_Paris
gptkb:Monarch
extraction from uranium
expanded understanding of alkali metals
last naturally occurring element discovered
|
|
gptkbp:dissolved
|
soluble
|
|
gptkbp:electronegativity
|
not well defined
0.7 (Pauling scale)
[ Rn] 7s1
[ Rn] 7s¹
|
|
gptkbp:financial_performance
|
unstable
|
|
gptkbp:geological_formation
|
< 1 part per trillion
|
|
gptkbp:historical_period
|
gptkb:television_series
|
|
gptkbp:historical_significance
|
one of the rarest elements on Earth.
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
Francium
|
|
gptkbp:ingredients
|
group 1
|
|
gptkbp:is_similar_to
|
gptkb:rubidium
lithium
sodium
cesium
|
|
gptkbp:isotopes
|
gptkb:Fr-223
gptkb:Radon-219
gptkb:1940
gptkb:Radium-223
gptkb:theorem
87
Fr-224
Fr-225
Fr-226
Fr-227
Francium-223
Francium-220
Francium-221
Francium-224
|
|
gptkbp:lifespan
|
22 minutes
|
|
gptkbp:location
|
gptkb:Database_Management_System
|
|
gptkbp:mass
|
223 u
|
|
gptkbp:melting_point
|
27 ° C
678 ° C
|
|
gptkbp:members
|
gptkb:musical
|
|
gptkbp:mode
|
radium
alpha decay
radon
|
|
gptkbp:named_after
|
gptkb:Monarch
|
|
gptkbp:occurs_in
|
extremely rare
trace amounts in uranium and thorium ores
|
|
gptkbp:origin
|
named after France
|
|
gptkbp:population
|
1.87 g/cm³
7.59 g/cm³
|
|
gptkbp:power_output
|
4.07 e V
|
|
gptkbp:products
|
gptkb:Francium_bromide
gptkb:Francium_chloride
gptkb:Francium_fluoride
gptkb:Francium_hydroxide
gptkb:Francium_iodide
Francium carbonate
Francium sulfate
|
|
gptkbp:replaced_by
|
gptkb:Marguerite_Perey
|
|
gptkbp:research_interest
|
nuclear physics
|
|
gptkbp:safety_features
|
handle with care due to radioactivity
highly radioactive and dangerous
|
|
gptkbp:side_effect
|
radioactive toxicity
|
|
gptkbp:symbol
|
Fr
|
|
gptkbp:uses
|
research purposes
|
|
gptkbp:was_a_response_to
|
very high
highly reactive
produced in nuclear reactions
similar to cesium
|
|
gptkbp:year_created
|
1939
|