Teknisyo

Technetium, 43Tc
Technetium
Pronunciation /tɛkˈnʃ(i)əm/ (tek-NEE-sh(ee-)əm)
Appearanceshiny gray metal
Mass number[97] (data not decisive)[a]
Technetium in the periodic table
Hydrogen Helium
Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon
Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon
Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon
Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon
Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson
Mn

Tc

Re
molybdenum ← technetium → ruthenium
Atomic number (Z)43
Group7
Period5
Block  d-block
Electron configuration[Kr] 4d5 5s2
Electrons per shell2, 8, 18, 13, 2
Physical properties
Phase at STPsolido
Melting point2430 K ​(2157 °C, ​3915 °F)
Boiling point4538 K ​(4265 °C, ​7709 °F)
Density (at 20° C)98Tc: 11.359 g/cm3
99Tc: 11.475 g/cm3[2]
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,[3] +2, +3,[3] +4, +5, +6, +7 (isang matapang na asidikong oksido)
ElectronegativityPauling scale: 1.9
Ionization energies
  • 1st: 686.9[4] kJ/mol
  • 2nd: 1470 kJ/mol
  • 3rd: 2850 kJ/mol
Atomic radiusempirical: 136 pm
Covalent radius147±7 pm
Van der Waals radius205 pm
Color lines in a spectral range
Mga linyang espektral ng technetium
Other properties
Crystal structurehexagonal close-packed (hcp) (hP2)
Lattice constants
Hexagonal close packed crystal structure for technetium
a = 274.12 pm
c = 439.90 pm (at 20 °C)[2]
Thermal expansion8.175×10−6/K (at 20 °C)[2]
Thermal conductivity50.6 W/(m⋅K)
Electrical resistivity200 nΩ⋅m (at 20 °C)
Magnetic orderingParamagnetic
Molar magnetic susceptibility+270.0×10−6 cm3/mol (298 K)[5]
Speed of sound thin rod16,200 m/s (at 20 °C)
CAS Number7440-26-8
History
PredictionDmitri Mendeleev (1871)
Discovery and first isolationEmilio Segrè and Carlo Perrier (1937)
Isotopes of technetium
Main isotopes[1] Decay
abun­dance half-life (t1/2) mode pro­duct
95mTc synth 61.96 d β+ 95Mo
IT 95Tc
96Tc synth 4.28 d β+ 96Mo
γ
97Tc synth 4.21×106 y ε 97Mo
97mTc synth 91.1 d IT 97Tc
ε ...
98Tc synth 4.2×106 y β− 98Ru
β+
99Tc trace 2.111×105 y β 99Ru
99mTc synth 6.01 h IT 99Tc
β
Kategorya Kategorya: Technetium
| references

Ang technetium ( /tɛkˈnʃiəm/) ay isang kemikal na elemento na may simbolong Tc at atomikong bilang na 43. 

Usbong Ang lathalaing ito ay isang usbong. Makatutulong ka sa Wikipedia sa pagpapalawig nito.


Usbong Ang lathalaing ito ay isang usbong. Makatutulong ka sa Wikipedia sa pagpapalawig nito.

Pasilip ng sanggunian

  1. 1.0 1.1 Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.{cite journal}: CS1 maint: date auto-translated (link)
  2. 2.0 2.1 2.2 Arblaster, John W. (2018). Selected Values of the Crystallographic Properties of Elements. Materials Park, Ohio: ASM International. ISBN 978-1-62708-155-9.{cite book}: CS1 maint: date auto-translated (link)
  3. 3.0 3.1 "Technetium: technetium(III) iodide compound data" (sa wikang Ingles). OpenMOPAC.net. Nakuha noong 2007-12-10.{cite web}: CS1 maint: date auto-translated (link)
  4. Mattolat, C.; Gottwald, T.; Raeder, S.; Rothe, S.; Schwellnus, F.; Wendt, K.; Thörle-Pospiech, P.; Trautmann, N. (24 Mayo 2010). "Determination of the first ionization potential of technetium". Physical Review A. 81: 052513. doi:10.1103/PhysRevA.81.052513.{cite journal}: CS1 maint: date auto-translated (link)
  5. Weast, Robert (1984). CRC, Handbook of Chemistry and Physics. Boca Raton, Florida: Chemical Rubber Company Publishing. pp. E110. ISBN 0-8493-0464-4.{cite book}: CS1 maint: date auto-translated (link)
  1. The most stable isotope of technetium cannot be determined based on existing data due to overlapping measurement uncertainties for the half-lives of the two longest-lived isotopes. The half-life of 97Tc with an uncertainty corresponding to one standard deviation is 4.21±0.16 million years, while that for 98Tc is 4.2±0.3 million years; these measurements have overlapping confidence intervals.[1]