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<p><b>New page</b></p><div>{{infobox element<br />
|name=technetium<br />
|number=43<br />
|symbol=Tc<br />
|abundance=<br />
|abundance in earth's crust=<br />
|abundance in oceans=<br />
|abundance in solar system=<br />
|left=[[molybdenum]]<br />
|right=[[ruthenium]]<br />
|above=[[manganese|Mn]]<br />
|below=[[rhenium|Re]]<br />
|category comment=<br />
|group=7<br />
|period=5<br />
|block=d<br />
|appearance=shiny gray metal<br />
|image name={{main other|Technetium.jpg}}<br />
|electrons per shell=2, 8, 18, 13, 2<br />
|phase=<br />
|phase comment=<br />
|density gplstp=<br />
|density gpcm3nrt=11<br />
|density gpcm3mp=<br />
|melting point K=2430<br />
|melting point C=2157<br />
|melting point F=3915<br />
|boiling point K=4538<br />
|boiling point C=4265<br />
|boiling point F=7709<br />
|triple point K=<br />
|triple point kPa=<br />
|critical point K=<br />
|critical point MPa=<br />
|heat fusion=33.29<br />
|heat vaporization=585.2<br />
|heat capacity=24.27<br />
|vapor pressure 1=2727<br />
|vapor pressure 10=2998<br />
|vapor pressure 100=3324<br />
|vapor pressure 1 k=3726<br />
|vapor pressure 10 k=4234<br />
|vapor pressure 100 k=4894<br />
|vapor pressure comment=''(extrapolated)''<br />
|crystal structure=hexagonal close packed<br />
|electronegativity=1.9<br />
|number of ionization energies=3<br />
|ionization energy 1=702<br />
|ionization energy 2=1470<br />
|ionization energy 3=2850<br />
|atomic radius=136<br />
|atomic radius calculated=<br />
|covalent radius=147±7<br />
|Van der Waals radius=<br />
|magnetic ordering=[[Paramagnetic]]<br />
|electrical resistivity unit prefix=n<br />
|electrical resistivity at 0=<br />
|electrical resistivity at 20=200<br />
|thermal conductivity=50.6<br />
|thermal conductivity 2=<br />
|thermal diffusivity=<br />
|thermal expansion=7.1<br />
|thermal expansion ref=<ref>{{cite book|author=Cverna, Fran |title=ASM Ready Reference: Thermal properties of metals |date=2002 |publisher=ASM International |isbn=978-0-87170-768-0 |url=http://www.owlnet.rice.edu/~msci301/ThermalExpansion.pdf |chapter=Ch. 2 Thermal Expansion}}</ref><br />
|thermal expansion comment=(at&nbsp;{{abbr|r.t.|room temperature}})<br />
|speed of sound=<br />
|speed of sound rod at 20=16,200<br />
|speed of sound rod at r.t.=<br />
|magnetic susceptibility= +270.0·10<sup>−6</sup><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=<br />
|Shear modulus=<br />
|Bulk modulus=<br />
|Poisson ratio=<br />
|Mohs hardness=<br />
|Vickers hardness=<br />
|Brinell hardness=<br />
|CAS number=7440-26-8<br />
|isotopes=<br />
{{infobox element/isotopes decay3 | mn=95m | sym=Tc<br />
|na=[[synthetic radioisotope|syn]] | hl=61&nbsp;d<br />
|dm1=[[electron capture|ε]] | de1=– | link1=molybdenum-95 | pn1=95 | ps1=Mo<br />
|dm2=[[gamma radiation|γ]] | de2=0.204, 0.582,<br/>0.835 | pn2= | ps2=–<br />
|dm3=[[internal conversion|IT]] | de3=0.0389, [[conversion electron|e]] | pn3=95 | ps3=Tc }}<br />
{{infobox element/isotopes decay2 | mn=96 | sym=Tc<br />
|na=syn | hl=4.3&nbsp;d<br />
|dm1=ε | de1=– | link1=molybdenum-96 | pn1=96 | ps1=Mo<br />
|dm2=γ | de2=0.778, 0.849,<br/>0.812 | pn2= | ps2=– }}<br />
{{infobox element/isotopes decay | mn=97 | sym=Tc<br />
|na=syn | hl=4.21×10<sup>6</sup>&nbsp;y<br />
|dm=ε | de=– | | link1=molybdenum-97 | pn=97 | ps=Mo }}<br />
{{infobox element/isotopes decay | mn=97m | sym=Tc<br />
|na=syn | hl=91&nbsp;d<br />
|dm=IT | de=0.965, e | pn=97 | ps=Tc }}<br />
{{infobox element/isotopes decay2 | mn=98 | sym=Tc<br />
|na=syn | hl=4.2×10<sup>6</sup>&nbsp;y<br />
|dm1=[[beta emission|β<sup>−</sup>]] | de1=0.4 | link1=ruthenium-98 | pn1=98 | ps1=Ru<br />
|dm2=γ | de2=0.745, 0.652 | pn2= | ps2=– }}<br />
{{infobox element/isotopes decay | mn=99 | sym=Tc | link=Technetium-99<br />
|na=[[trace radioisotope|trace]] | hl=2.111×10<sup>5</sup>&nbsp;y<br />
|dm=β<sup>−</sup> | de=0.294 | link1=ruthenium-99 | pn=99 | ps=Ru }}<br />
{{infobox element/isotopes decay2 | mn=99[[nuclear isomer|m]] | sym=Tc<br />
|na=syn | hl=6.01&nbsp;h<br />
|dm1=IT | de1=0.142, 0.002 | pn1=99 | ps1=Tc<br />
|dm2=γ | de2=0.140 | pn2= | ps2=– }}<br />
|predicted by=[[Dmitri Mendeleev]]<br />
|prediction date=1871<br />
|discovery and first isolation by=[[Emilio Segrè]] and [[Carlo Perrier]] <br />
|discovery date=1937<br />
|QID=Q1054<br />
}}<!--<br />
<br />
--><noinclude><br />
{{Infobox element/element navigation|symbol=Tc}}<br />
{{Template reference list}}<br />
{{documentation|1=Template:Infobox element/doc}}<br />
</noinclude></div>
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