Technetium (Tc) Elemental Symbol

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Technétium Technetium Tecneto Tecnécio Tecnecio Teknetium

Technetium Bohr ModelTechnetium is a Block D, Group 7, Period 5 element. The number of electrons in each of Technetium's shells is 2, 8, 18, 13, 2 and its electron configuration is [Kr] 4d5 5s2. The Technetium atom has a radius of and its Van der Waals radius is In its elemental form, CAS 7440-26-8, technetium has shinny gray appearance. Technetium is produced as a byproduct of the nuclear industry from spent nuclear fuel rods and was the first element to be made artificially. This is indicated by its name which originates from the Greek word "technetos" meaning artificial. Nearly all technetium is synthetically produced; however, it is found in nature in minute amounts as a result of naturally occurring spontaneous fission or neutron capture by molybdenum. Technetium was discovered by Carlo Perrier and Emilio Segre in 1937.

Technetium is used in nuclear medicine for a wide variety of diagnostic tests. Safety data for Technetium and its compounds can vary widely depending on the form. Technetium information, including technical data, safety data, high purity properties, research, applications and other useful facts are discussed below. Scientific facts such as the atomic structure, ionization energy, abundance on earth, conductivity and thermal properties are also included.

  • Properties
  • Research
  • Isotopes
  • Other Elements

Technetium Properties

Symbol: Tc Melting Point: 2157 oC, 3914.6 oF, 2430.15 K
Atomic Number: 43 Boiling Point: 4265 oC, 7709 oF, 4538.15 K
Atomic Weight: 98 Density: 11 g·cm−3
Element Category: transition metal Liquid Density @ Melting Point: N/A
Group, Period, Block: 7, 5, d Specific Heat: N/A
    Heat of Vaporization 585.2 kJ·mol−1
CHEMICAL STRUCTURE Heat of Fusion 33.29 kJ·mol−1
Electrons: 43 Thermal Conductivity: 50.6 W·m−1·K−1
Protons: 43 Thermal Expansion: N/A
Neutrons: 55 Electrical Resistivity: N/A
Electron Configuration: [Kr] 4d55s2 Electronegativity: 1.9 (Pauling scale)
Atomic Radius: 1.36 pm Tensile Strength: N/A
Covalent Radius: 147±7 pm Molar Heat Capacity: 24.27 J·mol−1·K−1
Van der Waals radius:   Young's Modulus: N/A
Oxidation States: 7, 6, 5, 4, 3, 2, 1, -1, -3 (strongly acidic oxide) Shear Modulus: N/A
Phase: Solid Bulk Modulus: N/A
Crystal Structure: hexagonal close-packed Poisson Ratio: N/A
Magnetic Ordering: Paramagnetic Mohs Hardness: N/A
1st Ionization Energy: 702.42 kJ mol-1 Vickers Hardness: N/A
2nd Ionization Energy: 702.42 kJ mol-1 Brinell Hardness: N/A
3rd Ionization Energy: 2850.20 kJ mol-1 Speed of Sound: (20 °C) 16,200 m·s−1
CAS Number: 7440-26-8 Abundance in typical human body, by weight: N/A
ChemSpider ID: 22396 Abundance in typical human body, by atom: N/A
PubChem CID: N/A Abundance in universe, by weight: N/A
MDL Number: N/A Abundance in universe, by atom: N/A
EC Number: N/A Discovered By: Carlo Perrier and Emilio Segrè
Beilstein Number: N/A Discovery Date: 1937
SMILES Identifier: [Tc]  
InChI Identifier: InChI=1S/Tc Other Names: N/A

Recent Research & Development for Technetium

  • Chuck Z. Soderquist, Michael J. Schweiger, Dong-Sang Kim, Wayne W. Lukens, John S. McCloy, Redox-dependent solubility of technetium in low activity waste glass, Journal of Nuclear Materials, Volume 449, Issues 1–3, June 2014
  • Sudha Rana, Navneet Sharma, Himanshu Ojha, Hosakote Gurumalappa Shivkumar, Sarwat Sultana, Rakesh Kumar Sharma, p-Tertbutylcalix[4]arene nanoemulsion: Preparation, characterization and comparative evaluation of its decontamination efficacy against Technetium-99m, Iodine-131 and Thallium-201, Colloids and Surfaces B: Biointerfaces, Volume 117, 1 May 2014
  • Jing He Wu, Gui Yang, Phase stability and physical properties of technetium borides: A first-principles study, Computational Materials Science, Volume 82, 1 February 2014
  • Sophie Jürgens, Wolfgang A. Herrmann, Fritz E. Kühn, Rhenium and technetium based radiopharmaceuticals: Development and recent advances, Journal of Organometallic Chemistry, Volume 751, 1 February 2014
  • A.E. Miroslavov, V.V. Gurziy, M.Yu. Tyupina, A.A. Lumpov, G.V. Sidorenko, Yu.S. Polotskii, D.N. Suglobov, Technetium and rhenium pentacarbonyl perchlorates: Structure and reactivity, Journal of Organometallic Chemistry, Volumes 745–746, 15 November 2013
  • Sarah E. Pepper, Mark D. Ogden, Perrhenate extraction studies by Cyphos 101-IL; screening for implementation in technetium removal, Separation and Purification Technology, Volume 118, 30 October 2013
  • E.Y. Kuo, M.J. Qin, G.J. Thorogood, K.R. Whittle, G.R. Lumpkin, S.C. Middleburgh, Technetium and ruthenium incorporation into rutile TiO2, Journal of Nuclear Materials, Volume 441, Issues 1–3, October 2013
  • Tesnim Dallagi, Mouldi Saidi, Anne Vessières, Michel Huché, Gérard Jaouen, Siden Top, Synthesis and antiproliferative evaluation of ferrocenyl and cymantrenyl triaryl butene on breast cancer cells. Biodistribution study of the corresponding technetium-99m tamoxifen conjugate, Journal of Organometallic Chemistry, Volume 734, 15 June 2013
  • Kirk J. Cantrell, Benjamin D. Williams, Solubility control of technetium release from Saltstone by TcO2·xH2O, Journal of Nuclear Materials, Volume 437, Issues 1–3, June 2013
  • Frederic Poineau, Benjamin P. Burton-Pye, Alesya Maruk, Gayane Kirakosyan, Ibthihel Denden, Daniel B. Rego, Erik V. Johnstone, Alfred P. Sattelberger, Massoud Fattahi, Lynn C. Francesconi, Konstantin E. German, Kenneth R. Czerwinski, On the nature of heptavalent technetium in concentrated nitric and perchloric acid, Inorganica Chimica Acta, Volume 398, 24 March 2013
  • Liu Fang, Wang Hui, Jia Yong-Fen, Wei Yan, Zhou Yu, Methyl-hydrazine Deoxidize Tc(VII) in Nitric Acid in Presence of U(VI) and Behavior of Technetium in the U/Pu Splitting Stage of APOR Process, Energy Procedia, Volume 39, 2013
  • A.E. Miroslavov, G.V. Sidorenko, A.A. Lumpov, D.N. Suglobov, O.V. Sizova, D.A. Maltsev, V.V. Gurzhiy, Yu.S. Polotskii, Reaction of technetium hexacarbonyl cation with acetonitrile: Kinetics, product structure, DFT calculations, Journal of Organometallic Chemistry, Volume 720, 1 December 2012
  • Hua Zhu, Zhi Yang, Nan Li, Xue-Juan Wang, Feng Wang, Hua Su, Qing Xie, Yan Zhang, Yun-Xia Ma, Bao-He Lin, Synthesis and characterization of well-defined l-lactic acid-caprolactone co-oligomers and their rhenium (I) and technetium(I) conjugates, Journal of Organometallic Chemistry, Volume 716, 1 October 2012
  • Kevin P. Maresca, Shawn M. Hillier, Genliang Lu, John C. Marquis, Craig N. Zimmerman, William C. Eckelman, John L. Joyal, John W. Babich, Small molecule inhibitors of PSMA incorporating technetium-99m for imaging prostate cancer: Effects of chelate design on pharmacokinetics, Inorganica Chimica Acta, Volume 389, 1 July 2012
  • T. Nicholson, A. Mahmood, N. Limpa-Amara, N. Salvarese, M.K. Takase, P. Müller, Z. Akgun, A.G. Jones, Reactions of the tridentate and tetradentate amine ligands di-(2-picolyl)(N-ethyl)amine and 2,5-bis-(2-pyridylmethyl)-2,5 diazohexane with technetium nitrosyl complexes, Inorganica Chimica Acta, Volume 373, Issue 1, 15 July 2011
  • T. Hartmann, A. Alaniz, F. Poineau, P.F. Weck, J.A. Valdez, M. Tang, G.D. Jarvinen, K.R. Czerwinski, K.E. Sickafus, Structure studies on lanthanide technetium pyrochlores as prospective host phases to immobilize 99technetium and fission lanthanides from effluents of reprocessed used nuclear fuels, Journal of Nuclear Materials, Volume 411, Issues 1–3, April 2011
  • Terrence L. Nicholson, Ashfaq Mahmood, Peter Muller, Alan Davison, Shannon Storm-Blanchard, Alun G. Jones, The synthesis and structural characterization of the technetium nitrosyl complexes [TcCl(NO)(SC5H4N)(PPh3)2] and [Tc(NO)(SC5H4N)2(PPh3)], Inorganica Chimica Acta, Volume 365, Issue 1, 15 January 2011
  • Christopher D. Taylor, Surface segregation and adsorption effects of iron–technetium alloys from first-principles, Journal of Nuclear Materials, Volume 408, Issue 2, 15 January 2011
  • Achour Seridi, Mariusz Wolff, Alexandre Boulay, Nathalie Saffon, Yvon Coulais, Claude Picard, Barbara Machura, Eric Benoist, Rhenium(I) and technetium(I) complexes of a novel pyridyltriazole-based ligand containing an arylpiperazine pharmacophore: Synthesis, crystal structures, computational studies and radiochemistry, Inorganic Chemistry Communications, Volume 14, Issue 1, January 2011
  • Dionysia Papagiannopoulou, George Makris, Charalambos Tsoukalas, Catherine P. Raptopoulou, Aris Terzis, Maria Pelecanou, Ioannis Pirmettis, Minas S. Papadopoulos, Rhenium(I) and technetium(I) fac-M(NSO)(CO)3 (M = Re, 99mTc) tricarbonyl complexes, with a tridentate NSO bifunctional agent: Synthesis, structural characterization, and radiochemistry, Polyhedron, Volume 29, Issue 2, 1 February 2010

Technetium Isotopes

Technetium has no stable isotopes (all are radioactive).