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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/cc
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/cc
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
Valence7
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 ClassesN/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.×106S/m
Resistivity2.×10-7m Ω
Superconducting Point7.8

Magnetic properties
Magnetic TypeN/A
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-Life4.12×106y
Lifetime6.02×106y
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.

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