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Technetium

Metal radioactivesolid
Symbol: Tc
Atomic number: 43
Atomic mass: (97.9072)
Group: Transition Metal
CAS-number: 7440-26-8

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Physical data
Isotopes
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Physical data

Electronic dataThermal dataSteric data
Shells: 2, 8, 18, 13, 2
Orbitals: [Kr] 4d5 5s2
Electronegativity: 1.9, 1.4
1. Ionization potential: 7.28 eV
2. Ionization potential: 15.26 eV
3. Ionization potential: 29.54 eV
Oxidation states: 7
Electrical conductivity: 0.067 10^6
Melting point: 2172 °C
Boiling point: 4877 °C
Specific heat: 0.21 J/gK
Heat of fusion: 24.0 kJ/mol
Heat of vaporization: 660.0 kJ/mol
Thermal conductivity: 0.506 W/cmK
Atomic radius: 1.95 Å
Ionic radius: -- Å
Covalent radius: 1.27 Å
Atomic volume: 8.5 cm³/mol
Density (293 K): 11.5 g/cm³
Crystal structure: hexagonal
hexagonal

Isotopes

NuclideAbundance [%]MassSpinHalflifeDecay modeDecay tree
95Tc 0 95 9/2 20.0h EC View
95Tcm 0 95 1/2 61.0d EC, IT View
96Tc 0 96 7 4.28d EC View
96Tcm 0 96 4 51.5m IT, EC, β+ View
97Tc 0 97 9/2 2.6E06y EC View
97Tcm 0 97 1/2 90.0d IT View
98Tc 0 97.9072 6 4.2E06y β- View
99Tc 0 98.908 9/2 2.13E05y β- View
99Tcm 0 97 1/2 6.01h IT, β- View
101Tc 0 101 9 14.2m β- View

Other info

Name origin:Greek: technêtos (artificial)
Description:Silvery-gray metal. First synthetically produced element.
Discovered by:Carlo Perrier, émillo Segrè
Year:1937
Place:Italy
Sources:Made first by bombarding molybdenum with deuterons (heavy hydrogen) in a cyclotron.
Use(s):Added to iron in quantities as low as 55 parts per million (ppm) transforms the iron into a corrosion-resistant alloy.