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setup>Double sharp at 02:26, 18 February 2021

2021-02-18T02:26:41Z

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{{Infobox element
|number=34
|symbol=Se
|name=selenium
|abundance=
|abundance in earth's crust=
|abundance in oceans=
|abundance in solar system=
|left=[[arsenic]]
|right=[[bromine]]
|above=[[sulfur|S]]
|below=[[tellurium|Te]]
|category comment=
|group=16
|period=4
|block=p
|image name=SeBlackRed.jpg
|appearance=grey metallic-looking, red, and vitreous black (not pictured) allotropes
|electrons per shell=2, 8, 18, 6
|phase=
|density gpcm3nrt=gray: 4.81
|density gpcm3nrt 2=alpha: 4.39
|density gpcm3nrt 3=vitreous: 4.28
|density gpcm3mp=3.99
|melting point K=494
|melting point C=221
|melting point F=430
|boiling point K=958
|boiling point C=685
|boiling point F=1265
|critical point K=1766
|critical point MPa=27.2
|heat fusion=gray: 6.69
|heat vaporization=95.48
|heat capacity=25.363
|vapor pressure 1=500
|vapor pressure 10=552
|vapor pressure 100=617
|vapor pressure 1 k=704
|vapor pressure 10 k=813
|vapor pressure 100 k=958
|vapor pressure comment=
|crystal structure=hexagonal
|electronegativity=2.55
|number of ionization energies=3
|ionization energy 1=941.0
|ionization energy 2=2045
|ionization energy 3=2973.7
|atomic radius=120
|covalent radius=120±4
|Van der Waals radius=190
|magnetic ordering=[[diamagnetic]]
|magnetic ordering ref=<ref>[http://www-d0.fnal.gov/hardware/cal/lvps_info/engineering/elementmagn.pdf Magnetic susceptibility of the elements and inorganic compounds], in {{RubberBible86th}}</ref>
|thermal conductivity=amorphous: 0.519
|thermal expansion at 25=amorphous: 37
|speed of sound rod at 20=3350
|magnetic susceptibility= −25.0·10−6
|magnetic susceptibility ref= (298 K)<ref>{{Cite book|title=CRC, Handbook of Chemistry and Physics|last=Weast|first=Robert|publisher=Chemical Rubber Company Publishing|year=1984|isbn=0-8493-0464-4|location=Boca Raton, Florida|pages=E110}}</ref>
|Young's modulus=10
|Shear modulus=3.7
|Bulk modulus=8.3
|Poisson ratio=0.33
|Mohs hardness=2.0
|Brinell hardness=736
|CAS number=7782-49-2
|isotopes=
{{infobox element/isotopes decay2 | mn=72 | sym=Se | na=[[synthetic radioisotope|syn]] | hl=8.4 d | dm1=[[electron capture|ε]] | de1=– | link1=arsenic-72 | pn1=72 | ps1=As | dm2=[[gamma radiation|γ]] | de2=0.046 | pn2= | ps2=–}}
{{infobox element/isotopes stable | mn=74 | sym=Se | na=0.86% | n=40 |firstlinks=yes}}
{{infobox element/isotopes decay2 | mn=75 | sym=Se | na=syn | hl=119.8 d | dm1=ε | de1=– | link1=arsenic-75 | pn1=75 | ps1=As | dm2=γ | de2=0.264, 0.136, 0.279 | pn2= | ps2=–}}
{{Infobox element/isotopes stable | mn=76 | sym=Se | na=9.23% | n=42 |firstlinks=no}}
{{Infobox element/isotopes stable | mn=77 | sym=Se | na=7.60% | n=43 |firstlinks=no}}
{{Infobox element/isotopes stable | mn=78 | sym=Se | na=23.69% | n=44 |firstlinks=no}}
{{infobox element/isotopes decay | mn=79 | sym=Se | na=[[trace radioisotope|trace]] | hl=3.27×105 y | dm=[[beta decay|β−]] | de=0.151 |link1=bromine-79 | pn=79 | ps=Br}}
{{infobox element/isotopes stable | mn=80 | sym=Se | na=49.80% | n=46 |firstlinks=no}}
{{infobox element/isotopes decay | mn=82 | sym=Se | na=8.82% | hl=1.08×1020 y | dm=[[double beta decay|β−β−]] | de=2.995 | link1=krypton-82 | pn=82 | ps=Kr}}
|isotopes comment=
|naming=after [[Selene]], Greek goddess of the moon
|discovery and first isolation by=[[Jöns Jakob Berzelius]] and [[Johann Gottlieb Gahn]]
|discovery date=1817
|QID=Q876
}}<noinclude>
{{Infobox element/element navigation|symbol=Se}}
{{Template reference list}}
{{documentation|1=Template:Infobox element/doc}}
</noinclude>

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Admin: 1 revision imported: setup

setup>Double sharp at 02:26, 18 February 2021