|
gptkbp:instanceOf
|
gptkb:chemical_compound
|
|
gptkbp:allotropes
|
amorphous selenium
black selenium
crystalline selenium
red selenium
|
|
gptkbp:appearance
|
gray (metallic luster)
|
|
gptkbp:atomicNumber
|
34
|
|
gptkbp:atomicWeight
|
78.971
|
|
gptkbp:block
|
p-block
|
|
gptkbp:boilingPoint
|
685 °C
|
|
gptkbp:CASNumber
|
7782-49-2
|
|
gptkbp:category
|
nonmetal
chalcogen
|
|
gptkbp:crystalSystem
|
hexagonal
|
|
gptkbp:density
|
4.81 g/cm³ (gray)
|
|
gptkbp:discoveredBy
|
gptkb:Jöns_Jacob_Berzelius
|
|
gptkbp:discoveredIn
|
1817
|
|
gptkbp:electronConfiguration
|
[Ar] 3d10 4s2 4p4
|
|
gptkbp:electronegativity
|
2.55 (Pauling scale)
|
|
gptkbp:foundIn
|
gptkb:Sweden
copper ores
sulfide ores
|
|
gptkbp:hasBiologicalActivity
|
essential trace element
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
Selenium
|
|
gptkbp:isotopes
|
gptkb:Se-74
gptkb:Se-76
gptkb:Se-80
Se-77
Se-78
Se-79
Se-82
|
|
gptkbp:mainIsotope
|
gptkb:Se-80
|
|
gptkbp:meltingPoint
|
221 °C
|
|
gptkbp:namedAfter
|
Selene (Greek goddess of the Moon)
|
|
gptkbp:oxidationStates
|
+2
0
+6
+4
-2
|
|
gptkbp:period
|
4
|
|
gptkbp:phaseAtSTP
|
gptkb:stone
|
|
gptkbp:positionInPeriodicTable
|
between arsenic and bromine
|
|
gptkbp:radioactive
|
Se-79
|
|
gptkbp:relatedGroup
|
16
|
|
gptkbp:roleInBiology
|
antioxidant
immune system function
component of selenoproteins
thyroid function
|
|
gptkbp:symbol
|
Se
|
|
gptkbp:toxicity
|
toxic in large amounts
|
|
gptkbp:uses
|
photocells
semiconductors
dietary supplements
glass production
pigments
alloys
|
|
gptkbp:bfsParent
|
gptkb:seafood
|
|
gptkbp:bfsLayer
|
3
|