|
gptkbp:instanceOf
|
gptkb:chemical_compound
|
|
gptkbp:appearance
|
unknown (likely metallic and silvery-gray)
|
|
gptkbp:atomicNumber
|
87
|
|
gptkbp:block
|
s-block
|
|
gptkbp:boilingPoint
|
estimated 677°C
|
|
gptkbp:CASNumber
|
7440-73-5
|
|
gptkbp:category
|
metal
element
alkali metal
|
|
gptkbp:density
|
estimated 2.48 g/cm³
|
|
gptkbp:discoveredBy
|
gptkb:Marguerite_Perey
|
|
gptkbp:discoveredIn
|
1939
|
|
gptkbp:electronConfiguration
|
[Rn] 7s1
|
|
gptkbp:electronegativity
|
0.7 (Pauling scale)
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
Francium
|
|
gptkbp:isotopes
|
over 30 known isotopes
|
|
gptkbp:IUPACName
|
gptkb:Francium
|
|
gptkbp:massNumber
|
223 u (most stable isotope)
|
|
gptkbp:meltingPoint
|
estimated 27°C
|
|
gptkbp:mostStableIsotope
|
gptkb:Francium-223
22 minutes (Fr-223)
|
|
gptkbp:namedAfter
|
gptkb:France
|
|
gptkbp:naturalOccurrence
|
trace amounts in uranium and thorium ores
|
|
gptkbp:oxidationStates
|
+1
|
|
gptkbp:period
|
7
|
|
gptkbp:phaseAtSTP
|
solid (predicted)
|
|
gptkbp:positionInPeriodicTable
|
period 7, group 1
|
|
gptkbp:radioactive
|
true
|
|
gptkbp:rarity
|
extremely rare
|
|
gptkbp:relatedGroup
|
alkali metal
|
|
gptkbp:standardState
|
solid (predicted)
|
|
gptkbp:symbol
|
Fr
|
|
gptkbp:uses
|
no significant commercial uses
|
|
gptkbp:bfsParent
|
gptkb:Solana
|
|
gptkbp:bfsLayer
|
5
|