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

  • William M. Kerlin, Frederic Poineau, Paul M. Forster, Kenneth R. Czerwinski, Alfred P. Sattelberger, Hydrothermal synthesis and solid-state structures of polynuclear technetium iodide compounds, Inorganica Chimica Acta, Available online 28 September 2014
  • 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

Technetium Isotopes

Technetium has no stable isotopes (all are radioactive).