Technical data for Technetium

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
Heat of Fusion23 kJ/mol
Heat of Vaporization550 kJ/mol
Heat of CombustionN/A
Specific Heat63 J/(kg K)[note]
Thermal Conductivity51 W/(m K)
Thermal ExpansionN/A

Bulk physical properties
Density11.5 g/cm3
Density (Liquid)N/A
Molar Volume8.522×10-6
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

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

Electrical properties
Electrical TypeConductor
Electrical Conductivity5×106 S/m
Resistivity2×10-7 m 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-Life4.12×106 y
Lifetime6.02×106 y
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.