Template:Infobox technetium/sandbox

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[[Category:Template:Pagetype with short description]]

Technetium, 43Tc
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Technetium
Pronunciation/tɛkˈnʃiəm/ (Template:Respell)
Appearanceshiny gray metal
Mass number[97]
Technetium in the periodic table
Template:Periodic table (32 columns, micro) Mn

Tc

Re
molybdenumtechnetiumruthenium
Atomic number (Z)43
Groupgroup 7
Periodperiod 5
Block  d-block
Electron configuration[Kr] 4d5 5s2
Electrons per shell2, 8, 18, 13, 2
Physical properties
Phase at STPsolid
Melting point2430 K ​(2157 °C, ​3915 °F)
Boiling point4538 K ​(4265 °C, ​7709 °F)
Density (near r.t.)11 g/cm3
Heat of fusion33.29 kJ/mol
Heat of vaporization585.2 kJ/mol
Molar heat capacity24.27 J/(mol·K)
Vapor pressure (extrapolated)
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 2727 2998 3324 3726 4234 4894
Atomic properties
Oxidation states−3, −1, 0, +1,[1] +2, +3,[1] +4, +5, +6, +7 (a strongly acidic oxide)
ElectronegativityPauling scale: 1.9
Ionization energies
  • 1st: 702 kJ/mol
  • 2nd: 1470 kJ/mol
  • 3rd: 2850 kJ/mol
Atomic radiusempirical: 136 pm
Covalent radius147±7 pm
Color lines in a spectral range
Spectral lines of technetium
Other properties
Natural occurrencefrom decay
Crystal structurehexagonal close-packed (hcp)
Hexagonal close packed crystal structure for technetium
Speed of sound thin rod16,200 m/s (at 20 °C)
Thermal conductivity50.6 W/(m·K)
Electrical resistivity200 nΩ·m (at 20 °C)
Magnetic orderingParamagnetic
CAS Number7440-26-8
History
PredictionDmitri Mendeleev (1871)
DiscoveryCarlo Perrier and Emilio Segrè (1937)
First isolationCarlo Perrier and Emilio Segrè (1937)
Main isotopes of technetium
[[Isotope|IsoTemplate:Shytope]] [[Natural abundance|AbunTemplate:Shydance]] Half-life (t1/2) Decay mode [[Decay product|ProTemplate:Shyduct]]
95mTc syn 61 d ε 95Mo
γ -
IT 95Tc
96Tc syn 4.3 d ε 96Mo
γ -
97Tc syn 2.6×106 y ε 97Mo
97mTc syn 91 d IT 97Tc
98Tc syn 4.2×106 y β 98Ru
γ -
99Tc trace 2.111×105 y β 99Ru
99mTc syn 6.01 h IT 99Tc
γ -
Category Category: Technetium
| references

References

  1. 1.0 1.1 1.2 1.3 "Technetium: technetium(III) iodide compound data". OpenMOPAC.net. Retrieved 2007-12-10. Cite error: Invalid <ref> tag; name "OpenMOPAC" defined multiple times with different content

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