HHomeBackground Color:He
LiBeTechnetium Main PageBlack White GrayBCNOFNe
NaMgTechnetium Pictures PageAlSiPSClAr
KCaTechnetium Isotope DataScTiVCrMnFeCoNiCuZnGaGeAsSeBrKr
RbSrYZrNbMoTcRuRhPdAgCdInSnSbTeIXe
CsBaLaCePrNdPmSmEuGdTbDyHoErTmYbLuHfTaWReOsIrPtAuHgTlPbBiPoAtRn
FrRaAcThPaUNpPuAmCmBkCfEsFmMdNoLrRfDbSgBhHsMtDsRgCnUutUuqUupUuhUusUuo

Technical data for Technetium

Click any property name to see plots of that property for all the elements.

Overview
NameTechnetium
SymbolTc
Atomic Number43
Atomic Weight98[note]
Density11.5 g/cm3
Melting Point2157 °C
Boiling Point4265 °C

Thermal properties
PhaseSolid
Melting Point2157 °C
Boiling Point4265 °C
Absolute Melting Point2430 K
Absolute Boiling Point4538 K
Critical PressureN/A
Critical TemperatureN/A
Heat of Fusion23 kJ/mol
Heat of Vaporization550 kJ/mol
Heat of CombustionN/A
Specific Heat63 J/(kg K)[note]
Adiabatic IndexN/A
Neel PointN/A
Thermal Conductivity51 W/(m K)
Thermal ExpansionN/A

Bulk physical properties
Density11.5 g/cm3
Density (Liquid)N/A
Molar Volume8.522×10-6
Brinell HardnessN/A
Mohs HardnessN/A
Vickers HardnessN/A
Bulk ModulusN/A
Shear ModulusN/A
Young ModulusN/A
Poisson RatioN/A
Refractive IndexN/A
Speed of SoundN/A
Thermal Conductivity51 W/(m K)
Thermal ExpansionN/A

Reactivity
Valence6
Electronegativity1.9
ElectronAffinity53 kJ/mol
Ionization Energies
702, 1470, 2850 kJ/mol

Health and Safety
Autoignition PointN/A
FlashpointN/A
Heat of CombustionN/A
DOT Hazard ClassN/A
DOT NumbersN/A
EU NumberN/A
NFPA Fire RatingN/A
NFPA HazardsN/A
NFPA Health RatingN/A
NFPA Reactivity RatingN/A
RTECS NumberN/A
NFPA LabelN/A

Classifications
Alternate NamesNone
Names of AllotropesNone
Blockd
Group7
Period5
Electron Configuration[Kr]4d55s2
ColorSilver
Discovery
1937 in Italy
Gas phaseN/A
CAS NumberCAS7440-26-8
CID NumberN/A
Gmelin NumberN/A
NSC NumberN/A
RTECS NumberN/A

Electrical properties
Electrical TypeConductor
Electrical Conductivity5×106 S/m
Resistivity2×10-7 m Ω
Superconducting Point7.8

Magnetic properties
Magnetic TypeParamagnetic
Curie PointN/A
Mass Magnetic Susceptibility3.42×10-8
Molar Magnetic Susceptibility3.352×10-9
Volume Magnetic Susceptibility0.0003933

Abundances
% in UniverseN/A
% in SunNone
% in MeteoritesNone
% in Earth's CrustNone
% in OceansNone
% in HumansNone

Atomic dimensions and structure
Atomic Radius183 pm
Covalent Radius156 pm
Van der Waals RadiusN/A
Crystal StructureSimple Hexagonal
Lattice Angles
π/2, π/2, 2 π/3
Lattice Constants
273.5, 273.5, 438.8 pm
Space Group NameP63/mmc
Space Group Number194

Nuclear Properties
Half-Life4.12×106 y
Lifetime6.02×106 y
Decay ModeBetaDecay
Quantum Numbers6S5/2
Neutron Cross Section22
Neutron Mass AbsorptionN/A
Known Isotopes
85Tc, 86Tc, 87Tc, 88Tc, 89Tc, 90Tc, 91Tc, 92Tc, 93Tc, 94Tc, 95Tc, 96Tc, 97Tc, 98Tc, 99Tc, 100Tc, 101Tc, 102Tc, 103Tc, 104Tc, 105Tc, 106Tc, 107Tc, 108Tc, 109Tc, 110Tc, 111Tc, 112Tc, 113Tc, 114Tc, 115Tc, 116Tc, 117Tc, 118Tc
Stable Isotopes
Isotopic Abundances


Notes on the properties of Technetium:

Atomic Weight: Atomic mass number given for longest lived isotope.

Specific Heat: Value given for gas phase.

Up to date, curated data provided by
Mathematica's ElementData function from Wolfram Research, Inc.

The Elements book Mad Science book Periodic Table Poster  Click here to buy a book, photographic periodic table poster, card deck, or 3D print based on the images you see here!