「Să̤ (gó-tā̤)」調整以後𣍐蜀樣其地方
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無編輯摘要 |
無編輯摘要 |
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Dâ̤ 1 hòng:
{{Infobox element
|number=34
|symbol=Se
|name=Selen
|enname=selenium
|laname=selenium
|left=[[Piĕ (nguòng-só)|Piĕ]]
|right=[[Chéu (nguòng-só)|Chéu]]
|above=[[Liù-uòng]]
|below=[[Dá̤ (nguòng-só)|Telua]]
|series=hĭ-gĭng-sṳ̆k
|series comment=sometimes considered a [[metalloid]]
|group=16
|period=4
|block=p
|image name=SeBlackRed.jpg
|appearance=black, red, and gray (not pictured) allotropes
|atomic mass=78.971
|atomic mass ref=<ref name="IUPAC">[http://www.ciaaw.org/atomic-weights.htm Standard Atomic Weights 2013]. [[Commission on Isotopic Abundances and Atomic Weights]]</ref>
|atomic mass 2=8
|atomic mass comment=
|electron configuration=[[[argon|Ar]]] 3d<sup>10</sup> 4s<sup>2</sup> 4p<sup>4</sup>
|electrons per shell=2, 8, 18, 6
|phase=gó-tā̤
|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
|oxidation states='''6''', 5, '''4''', 3, '''2''', 1,<ref>{{Greenwood&Earnshaw}}</ref> −1, '''−2'''
|oxidation states comment=(a strongly [[acid]]ic oxide)
|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
|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 decay | mn=74 | sym=Se | na=0.87% | hl=– | dm=([[double beta decay|β<sup>+</sup>β<sup>+</sup>]]) | de=1.2094 | link1=germanium-74 | pn=74 | ps=Ge }}
{{infobox element/isotopes decay2 | mn=75 | sym=Se | na=syn | hl=119.779 d | dm1=ε | de1=– | link1=arsenic-75 | pn1=75 | ps1=As | dm2=γ | de2=0.264, 0.136,<br/>0.279 | pn2= | ps2=–}}
{{Infobox element/isotopes stable | mn=76 | sym=Se | na=9.36% | n=42 |firstlinks=yes}}
{{Infobox element/isotopes stable | mn=77 | sym=Se | na=7.63% | n=43 |firstlinks=no}}
{{Infobox element/isotopes stable | mn=78 | sym=Se | na=23.78% | n=44 |firstlinks=no}}
{{infobox element/isotopes decay | mn=79 | sym=Se | na=[[trace radioisotope|trace]] | hl=3.27×10<sup>5</sup> y | dm=[[beta decay|β<sup>−</sup>]] | de=0.151 |link1=bromine-79 | pn=79 | ps=Br}}
{{infobox element/isotopes decay | mn=80 | sym=Se | na=49.61% | hl=– | dm=([[double beta decay|β<sup>−</sup>β<sup>−</sup>]]) | de=0.1339 | link1=krypton-80 | pn=80 | ps=Kr }}
{{infobox element/isotopes decay | mn=82 | sym=Se | na=8.73% | hl=1.08×10<sup>20</sup> y | dm=β<sup>−</sup>β<sup>−</sup> | de=2.995 | link1=krypton-82 | pn=82 | ps=Kr}}
|isotopes comment=Decay modes in parentheses are predicted, but have not yet been observed
|naming=after [[Selene]], Greek goddess of the moon
|discovery and first isolation by=[[Jöns Jakob Berzelius]] and [[Johann Gottlieb Gahn]]
|discovery date=1817
}}
'''Să̤''' (硒) sê siŏh cṳ̄ng [[hĭ-gĭng-sṳ̆k]] [[huá-hŏk nguòng-só|nguòng-só]]. [[Nguòng-cṳ̄ sê̤ṳ-só]] sê 34, huá-hŏk hù-hô̤ sê Se.
==Huá-hŏk séng-cék==
第7行 ⟶ 第90行：
==Cié-chṳ̄==
==Chăng-kō̤ cṳ̆-lâiu==
{{reflist}}
{{Ciŭ-gĭ-biēu}}
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