The chemical symbol for Technetium is Tc and its atomic number is 43.
We find it listed in the periodic table of elements in group 7 and period 5 and block.
Technetium belongs to the family of transition metals such as for example the Silver, the Bohrium, cadmium, ...
This element is Radioactive.
Atomic number (Z) 43
Group, block group 7, d-block
Period: period 5
Element category: transition metal
Standard atomic weight (Ar) [98]
Electron configuration: [Kr] 4d5 5s2
per shell: 2, 8, 18, 13, 2
Physical properties
Phase: solid
Melting point: 2430 K (2157 °C, 3915 °F)
Boiling point: 4538 K (4265 °C, 7709 °F)
Density near r.t. : 11 g/cm3
Heat of fusion: 33.29 kJ/mol
Heat of vaporization: 585.2 kJ/mol
Molar heat capacity: 24.27 J/(mol·K)
Atomic properties
Oxidation states: 7, 6, 5, 4, 3, 2, 1, −1, −3 (a strongly acidic oxide)
Electronegativity: Pauling scale: 1.9
Ionization energies 1st: 702 kJ/mol
2nd: 1470 kJ/mol
3rd: 2850 kJ/mol
Atomic radius empirical: 136 pm
Covalent radius: 147±7 pm
Crystal structure: hexagonal close-packed
Speed of sound thin rod: 16,200 m/s (at 20 °C)
Thermal expansion: 7.1 µm/(m·K)[2] (at r.t.)
Thermal conductivity: 50.6 W/(m·K)
Electrical resistivity: 200 nΩ·m (at 20 °C)
Magnetic ordering Paramagnetic
CAS Number: 7440-26-8