Discovered By: Carlo Perrier, Emilio Segre
Discovery year: 1937

The following table showing some properties of Technetium(Tc):

Table Example
Atomic number 43
Group 7
Period 5
Block d
Electrons 43
Protons 43
Neutrons 55
Atomic weight (98)
Oxidatio states -1, +4, +7
Ionic charge Tc^7+


Table Example
Electron per shell K2 L8 M18 N13 O2
Electron configuration 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 4d^5
Atomic radius 183 pm
Covalent radius 147 pm
Boiling point 4265°C
Melting point 2157°C
Phase Solid
Fusion heat 23 kJ.mol^-1
Vaporization heat 550 kJ.mol^-1
Specific heat 63 J.kg^-1K^-1


Table Example
Color Silver
Density 11500 kg.m^-3
Molar volume 8.5*10
^-6 m^3.mol^-1
Electic type Conductor
Magnetic type Paramagnetic
Volume magnetic susceptibility 3.933*10^-4
Mass magnetic susceptibility 3.42*10^-8 m^3.kg^-1
Molar magnetic susceptibility 3.352*10^-9 m^3.mol^-1
Resistivity 2.10^-7 Ohm.m
Superconducting point 7.8 K


Table Example
Electronegativity 1.9
Valence 7
Electron affinity 53 kJ.mol^-1
First ionization energy 702 kJ.mol^-1
Radioactive Yes
Half life 6.7*10^12 s
Lifetime 1.9*10^14 s
neutro cross section 22 barn
Decay mode Beta decay(β)
Thermal conductivity 51 W.m^-1.K^-1