Stable isotope Technetium (Tc)

Isotope Atomic Mass Half-life Mode of Decay Nuclear Spin Nuclear Magnetic Moment
Tc-93 92.910248 2.73 hours EC to Mo-93 9/2 6.26
Tc-94 93.909655 4.88 hours EC to Mo-94 7 5.08
Tc-95 94.90766 20.00 hours EC to Mo-95 9/2 5.89
Tc-96 95.90787 4.30 days EC to Mo-96 7 5.04
Tc-97 96.906364 2.60 x 106 years EC to Mo-97 9/2 No data available
Tc-98 97.907215 4.20 x 106 years β- to Ru-98 6 No data available
Tc-99 98.907 213,000 years β- to Ru-99 9/2 5.6847
 

Properties of Technetium

Name Technetium
Symbol Tc
Atomic number 43
Atomic weight 98
Standard state Solid at 298 ºK
CAS Registry ID 7440-26-8
Group in periodic table 7
Group name None
Period in periodic table 5
Block in periodic table d-block
Color Silvery gray metallic
Classification Metallic
Melting point 2157 °C
Boiling point 4265 °C
Thermal conductivity 50.6 W/(m·K)
Electronegativity 1.9
Heat of vaporization 585.2 kJ·mol-1
Heat of fusion 33.29 kJ·mol-1
Density of solid 11 g/cm3 
Electron configuration [Kr]4d55s2
Oxidation states -3, -1, +1, +2, +3, +4, +5, +6, +7