text: # Tantalum
  Chăng-kō̤ Mìng-dĕ̤ng-ngṳ̄ Háng-cê gì bēng-buōng. / 參考閩東語漢字其版本。
  Tantalum sê siŏh cṳ̄ng gĭng-sṳ̆k, iâ sê siŏh cṳ̄ng huá-hŏk nguòng-só.  Nguòng-cṳ̄ sê̤ṳ-só sê 73, huá-hŏk hù-hô̤ sê Ta.
title: Tantalum
wikitext: {{twinLAT|鉭}}
  {{Infobox element
  |number=73
  |symbol=Ta
  |name=Tantan
  |enname=tantalum
  |laname=tantalum
  |left=[[hafnium|Hafni]]
  |right=[[Ŭ (gĭng-sṳ̆k)|wolfram]]
  |above=[[niobium|Niobi]]
  |below=[[dubnium|Dubni]]
  |series=guó-dô gĭng-sṳ̆k
  |group=5
  |period=6
  |block=d
  |image name=Tantalum_single_crystal_and_1cm3_cube.jpg
  |appearance=gray blue
  |image name 2=Tantalum_spectrum_visible.png
  |image name 2 comment=[[Spectral line]]s of tantalum
  |atomic mass=180.94788
  |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=2
  |atomic mass comment=
  |electron configuration=&#91;[[xenon|Xe]]&#93; 4f<sup>14</sup> 5d<sup>3</sup> 6s<sup>2</sup>
  |electrons per shell=2, 8, 18, 32, 11, 2
  |phase=gó-tā̤
  |density gpcm3nrt=16.69
  |density gpcm3mp=15
  |melting point K=3290
  |melting point C=3017
  |melting point F=5463
  |boiling point K=5731
  |boiling point C=5458
  |boiling point F=9856
  |heat fusion=36.57
  |heat vaporization=753
  |heat capacity=25.36
  |vapor pressure 1=3297
  |vapor pressure 10=3597
  |vapor pressure 100=3957
  |vapor pressure 1 k=4395
  |vapor pressure 10 k=4939
  |vapor pressure 100 k=5634
  |vapor pressure comment=
  |crystal structure=body-centered cubic
  |crystal structure ref=<ref name="crystal structure">{{Cite journal | doi = 10.1107/S0567740873004140 | title = The crystal structure of β-tantalum | year = 1973 | last1 = Moseley | first1 = P. T. | last2 = Seabrook | first2 = C. J. | journal = Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry | volume = 29 | issue = 5 | pages = 1170–1171}}</ref>
  |crystal structure comment=&alpha;-Ta
  |crystal structure 2=tetragonal
  |crystal structure 2 ref=<ref name="crystal structure"/>
  |crystal structure 2 comment=&beta;-Ta
  |oxidation states='''5''', 4, 3, 2, 1, −1, −3
  |oxidation states comment=(a&nbsp;mildly [[acid]]ic oxide)
  |electronegativity=1.5
  |number of ionization energies=2
  |ionization energy 1=761
  |ionization energy 2=1500
  |atomic radius=146
  |covalent radius=170±8
  |magnetic ordering=[[paramagnetic]]
  |magnetic ordering ref=<ref name=magnet>{{cite book | url = http://www-d0.fnal.gov/hardware/cal/lvps_info/engineering/elementmagn.pdf | chapter = Magnetic susceptibility of the elements and inorganic compounds | editor = Lide, D. R. | title = CRC Handbook of Chemistry and Physics | edition = 86th | location = Boca Raton (FL) | publisher = CRC Press | year = 2005 | isbn = 0-8493-0486-5 | accessdate = 2018-06-03 | archive-date = 2011-03-03 | archive-url = https://web.archive.org/web/20110303222309/http://www-d0.fnal.gov/hardware/cal/lvps_info/engineering/elementmagn.pdf | deadurl =  }}</ref>
  |electrical resistivity unit prefix=n
  |electrical resistivity at 20=131
  |thermal conductivity=57.5
  |thermal expansion at 25=6.3
  |speed of sound rod at 20=3400
  |Young's modulus=186
  |Shear modulus=69
  |Bulk modulus=200
  |Poisson ratio=0.34
  |Mohs hardness=6.5
  |Vickers hardness=870–1200
  |Brinell hardness=440–3430
  |CAS number=7440-25-7
  |isotopes=
  {{Infobox element/isotopes decay | mn=177 | sym=Ta
   | na=[[synthetic radioisotope|syn]] | hl=56.56&nbsp;h
   | dm=[[electron capture|ε]] | de=1.166 | link1=hafnium-177 | pn=177 | ps=Hf}}
  {{Infobox element/isotopes decay | mn=178 | sym=Ta
   | na=syn | hl=2.36&nbsp;h
   | dm=ε | de=1.910 | link1=hafnium-178 | pn=178 | ps=Hf}}
  {{Infobox element/isotopes decay | mn=179 | sym=Ta
   | na=syn | hl=1.82&nbsp;y
   | dm=ε | de=0.110 | link1=hafnium-179 | pn=179 | ps=Hf}}
  {{Infobox element/isotopes decay2 | mn=180 | sym=Ta
   | na=syn | hl=8.125&nbsp;h
   | dm1=ε | de1=0.854 | link1=hafnium-180 | pn1=180 | ps1=Hf
   | dm2=[[beta emission|β<sup>−</sup>]] | de2=0.708 | link2=tungsten-180 | pn2=180 | ps2=W}}
  {{Infobox element/isotopes decay4 | mn=180[[Nuclear isomer|m]] | sym=Ta
   | na=0.012% | hl=>2.0&times;10<sup>16</sup>&nbsp;y
   | dm1=(ε) | de1=0.929 | pn1=180 | ps1=Hf
   | dm2=(β<sup>−</sup>) | de2=0.783 | pn2=180 | ps2=W
   | dm3=([[isomeric transition|IT]]) | de3=0.075 | pn3=180 | ps3=Ta
   | dm4=([[alpha decay|α]]) | de4=2.103 | link4=lutetium-176 | pn4=176 | ps4=Lu}}
  {{infobox element/isotopes decay | mn=181 | sym=Ta | na=99.988% | hl=– | dm=(α) | de=1.5259 | link1=lutetium-177 | pn=177 | ps=Lu }}
  {{Infobox element/isotopes decay | mn=182 | sym=Ta
   | na=syn | hl=114.43&nbsp;d
   | dm=β<sup>−</sup> | de=1.814 | link1=tungsten-182 | pn=182 | ps=W}}
  {{Infobox element/isotopes decay | mn=183 | sym=Ta
   | na=syn | hl=5.1&nbsp;d
   | dm=β<sup>−</sup> | de=1.070 | link1=tungsten-183 | pn=183 | ps=W}}
  |isotopes comment=Decay modes in parentheses are predicted, but have not yet been observed
  |discovered by=[[Anders Gustaf Ekeberg]]
  |discovery date=1802
  |history comment label=Recognized as a distinct [[chemical element|element]] by
  |history comment=[[Heinrich Rose]] (1844)
  }}
  '''Tantalum''' sê siŏh cṳ̄ng [[gĭng-sṳ̆k]], iâ sê siŏh cṳ̄ng [[huá-hŏk nguòng-só]].  [[Nguòng-cṳ̄ sê̤ṳ-só]] sê 73, huá-hŏk hù-hô̤ sê Ta.
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