Template:Infobox technetium

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

Technetium, 43Tc
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 expansion7.1 µm/(m·K)[2] (at r.t.)
Thermal conductivity50.6 W/(m·K)
Electrical resistivity200 nΩ·m (at 20 °C)
Magnetic orderingParamagnetic
Magnetic susceptibility+270.0·10−6 cm3/mol (298 K)[3]
CAS Number7440-26-8
History
PredictionDmitri Mendeleev (1871)
Discovery and first isolationEmilio Segrè and Carlo Perrier (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 4.21×106 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

[[Category:Infobox templates|Template:Remove first word]]

data m.p. cat
in calc from C diff report ref
C 2157
K 2430 2430 0
F 3915 3915 0 Template:Subpage other
max precision 0
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input C: 2157, K: 2430, F: 3915
comment
data b.p. cat
in calc from C diff report ref
C 4265
K 4538 4538 0
F 7709 7709 0 Template:Subpage other
max precision 0
WD Template:Wikidata Script error: No such module "EditAtWikidata". Template:Wikidata
input C: 4265, K: 4538, F: 7709
comment
Mo ←

i'box Mo

iso
43
Tc (E)
→ Ru

i'box Ru

  Data sets read by {{Infobox element}}
Name and identifiers
Top image (caption, alt)
Pronunciation
Category (enwiki)
Standard atomic weight
  most stable isotope
Natural occurrence
Phase at STP
Oxidation states
Spectral lines image
Electron configuration (cmt, ref)
Term symbol * (cmt, ref)
Wikidata *
* Not used in {{Infobox element}} (2019-02-03)
See also {{Infobox element/symbol-to--navbox}}

References

  1. 1.0 1.1 "Technetium: technetium(III) iodide compound data". OpenMOPAC.net. Retrieved 2007-12-10.
  2. Cverna, Fran (2002). "Ch. 2 Thermal Expansion". ASM Ready Reference: Thermal properties of metals (PDF). ASM International. ISBN 978-0-87170-768-0.
  3. Weast, Robert (1984). CRC, Handbook of Chemistry and Physics. Boca Raton, Florida: Chemical Rubber Company Publishing. pp. E110. ISBN 0-8493-0464-4.

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