|
gptkbp:instanceOf
|
gptkb:chemical_compound
|
|
gptkbp:appearance
|
silvery metallic
|
|
gptkbp:atomicNumber
|
93
|
|
gptkbp:atomicWeight
|
[237]
|
|
gptkbp:boilingPoint
|
4273 K
|
|
gptkbp:CASNumber
|
7439-99-8
|
|
gptkbp:category
|
actinide
|
|
gptkbp:color
|
silvery
|
|
gptkbp:crystalSystem
|
orthorhombic
|
|
gptkbp:density
|
20.45 g/cm³
|
|
gptkbp:discoveredBy
|
gptkb:Edwin_McMillan
gptkb:Philip_H._Abelson
|
|
gptkbp:discoveredIn
|
1940
|
|
gptkbp:electronConfiguration
|
[Rn] 5f4 6d1 7s2
|
|
gptkbp:electronegativity
|
1.36 (Pauling scale)
|
|
gptkbp:firstTransuranicElement
|
true
|
|
gptkbp:foundIn
|
gptkb:United_States
|
|
gptkbp:foundInNature
|
trace amounts
|
|
gptkbp:halfLifeOfNp-237
|
2.14 million years
|
|
gptkbp:halfLifeOfNp-239
|
2.356 days
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
Neptunium
|
|
gptkbp:isotopes
|
gptkb:Neptunium-235
gptkb:Neptunium-236
gptkb:Neptunium-237
gptkb:Neptunium-238
gptkb:Neptunium-239
|
|
gptkbp:locatedIn
|
Lawrence Berkeley National Laboratory (discovery)
|
|
gptkbp:mainIsotope
|
gptkb:Neptunium-237
gptkb:Neptunium-239
|
|
gptkbp:meltingPoint
|
917 K
|
|
gptkbp:namedAfter
|
gptkb:Neptune_(planet)
|
|
gptkbp:namedFor
|
gptkb:Edwin_McMillan
gptkb:Philip_H._Abelson
|
|
gptkbp:naturalOccurrence
|
trace amounts in uranium ores
|
|
gptkbp:oxidationStates
|
+3
+5
+6
+4
|
|
gptkbp:periodicTableGroup
|
7
actinide
|
|
gptkbp:producedBy
|
nuclear reactors
|
|
gptkbp:radioactive
|
true
|
|
gptkbp:riskFactor
|
radioactive toxicity
|
|
gptkbp:stateAtRoomTemperature
|
gptkb:stone
|
|
gptkbp:symbol
|
Np
|
|
gptkbp:usedFor
|
neutron detection
precursor for plutonium-238
|
|
gptkbp:bfsParent
|
gptkb:The_Transuranium_Elements
|
|
gptkbp:bfsLayer
|
5
|