43Solid
Tc 98 Atomic mass · uTransition metals
Technetium
Technetium (/tɛkˈniːʃiəm/) is a chemical element with symbol Tc and atomic number 43. It is the element with the lowest atomic number in the periodic table that has no stable isotopes:every form of it is radioactive. Nearly all technetium is produced synthetically, and only minute amounts are found in nature.
Discovery 1937 (Emilio Segrè)
K2L8M18N13O2
Physical properties
Values for the element in its standard state.
- Density
- 11.5g/cm³
- Melting point
- 2,430K
- Boiling point
- 4,538K
- Atomic radius
- 156pm
- Bonding type
- Metallic
- Molar heat
- 24.27J/(mol·K)
Inside the atom
Electron arrangement and the energy behind its behavior.
Full electron configuration
1s, 2 electrons; 2s, 2 electrons; 2p, 6 electrons; 3s, 2 electrons; 3p, 6 electrons; 3d, 10 electrons; 4s, 2 electrons; 4p, 6 electrons; 4d, 5 electrons; 5s, 2 electrons;
[Kr] represents 36 core electrons. The full view shows them explicitly.
43 electrons Orbital order preserved from source
- Electronegativity
- 1.9Pauling scale
- First ionization energy
- 702kJ/mol
- Electron affinity
- 53kJ/mol
- Van der Waals radius
- Not available
Tc TechnetiumAtomic number 43
702kJ/mol
Atomic numberGaps indicate unavailable data
About technetium
- Appearance
- Shiny gray metal
- Discovery
- 1937 (Emilio Segrè)
- Data source
- Read the reference
A missing value means it is unavailable in this reference dataset. Values can vary with measurement method and conditions.