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Template:Infobox selenium - Revision history
2026-10-18T04:58:07Z
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imported>Eric Kvaalen: It is hexagonal (the gray form), but more specific'ly trigonal.
2021-10-18T18:59:55Z
<p>It is hexagonal (the gray form), but more specific'ly trigonal.</p>
<p><b>New page</b></p><div>{{Infobox element<br />
|number=34<br />
|symbol=Se<br />
|name=selenium<br />
|abundance=<br />
|abundance in earth's crust=<br />
|abundance in oceans=<br />
|abundance in solar system=<br />
|left=[[arsenic]]<br />
|right=[[bromine]]<br />
|above=[[sulfur|S]]<br />
|below=[[tellurium|Te]]<br />
|image name=SeBlackRed.jpg<br />
|appearance=grey metallic-looking, red, and vitreous black (not pictured) allotropes<br />
|electrons per shell=2, 8, 18, 6<br />
|phase=<br />
|density gpcm3nrt=gray: 4.81<br />
|density gpcm3nrt 2=alpha: 4.39<br />
|density gpcm3nrt 3=vitreous: 4.28<br />
|density gpcm3mp=3.99<br />
|melting point K=494<br />
|melting point C=221<br />
|melting point F=430<br />
|boiling point K=958<br />
|boiling point C=685<br />
|boiling point F=1265<br />
|critical point K=1766<br />
|critical point MPa=27.2<br />
|heat fusion=gray: 6.69<br />
|heat vaporization=95.48<br />
|heat capacity=25.363<br />
|vapor pressure 1=500<br />
|vapor pressure 10=552<br />
|vapor pressure 100=617<br />
|vapor pressure 1 k=704<br />
|vapor pressure 10 k=813<br />
|vapor pressure 100 k=958<br />
|vapor pressure comment=<br />
|crystal structure=trigonal<br />
|electronegativity=2.55<br />
|number of ionization energies=3<br />
|ionization energy 1=941.0<br />
|ionization energy 2=2045<br />
|ionization energy 3=2973.7<br />
|atomic radius=120<br />
|covalent radius=120±4<br />
|Van der Waals radius=190<br />
|magnetic ordering=[[diamagnetic]]<br />
|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><br />
|thermal conductivity=amorphous: 0.519<br />
|thermal expansion at 25=amorphous: 37<br />
|speed of sound rod at 20=3350<br />
|magnetic susceptibility= {{val|−25.0|e=−6}}<br />
|magnetic susceptibility ref= &#x20;(298&nbsp;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><br />
|Young's modulus=10<br />
|Shear modulus=3.7<br />
|Bulk modulus=8.3<br />
|Poisson ratio=0.33<br />
|Mohs hardness=2.0<br />
|Brinell hardness=736<br />
|CAS number=7782-49-2<br />
|isotopes=<br />
{{infobox element/isotopes decay2 | mn=72 | sym=Se | na=[[synthetic radioisotope|syn]] | hl=8.4&nbsp;d | dm1=[[electron capture|ε]] | de1=– | link1=arsenic-72 | pn1=72 | ps1=As | dm2=[[gamma radiation|γ]] | de2=0.046 | pn2= | ps2=–}}<br />
{{infobox element/isotopes stable | mn=74 | sym=Se | na=0.86% | n=40 |firstlinks=yes}}<br />
{{infobox element/isotopes decay2 | mn=75 | sym=Se | na=syn | hl=119.8&nbsp;d | dm1=ε | de1=– | link1=arsenic-75 | pn1=75 | ps1=As | dm2=γ | de2=0.264, 0.136,<br/>0.279 | pn2= | ps2=–}}<br />
{{Infobox element/isotopes stable | mn=76 | sym=Se | na=9.23% | n=42 |firstlinks=no}}<br />
{{Infobox element/isotopes stable | mn=77 | sym=Se | na=7.60% | n=43 |firstlinks=no}}<br />
{{Infobox element/isotopes stable | mn=78 | sym=Se | na=23.69% | n=44 |firstlinks=no}}<br />
{{infobox element/isotopes decay | mn=79 | sym=Se | na=[[trace radioisotope|trace]] | hl=3.27&times;10<sup>5</sup>&nbsp;y | dm=[[beta decay|β<sup>−</sup>]] | de=0.151 |link1=bromine-79 | pn=79 | ps=Br}}<br />
{{infobox element/isotopes stable | mn=80 | sym=Se | na=49.80% | n=46 |firstlinks=no}}<br />
{{infobox element/isotopes decay | mn=82 | sym=Se | na=8.82% | hl=1.08&times;10<sup>20</sup>&nbsp;y | dm=[[double beta decay|β<sup>−</sup>β<sup>−</sup>]] | de=2.995 | link1=krypton-82 | pn=82 | ps=Kr}}<br />
|isotopes comment=<br />
|naming=after [[Selene]], Greek goddess of the moon<br />
|discovery and first isolation by=[[Jöns Jakob Berzelius]] and [[Johann Gottlieb Gahn]]<br />
|discovery date=1817<br />
|QID=Q876<br />
}}<!--<br />
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--><noinclude><br />
{{Infobox element/element navigation|symbol=Se}}<br />
{{Template reference list}}<br />
{{documentation|1=Template:Infobox element/doc}}<br />
</noinclude></div>
imported>Eric Kvaalen