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.
A stylized shell model. Electrons are quantum objects, not particles following these literal paths. Sizes and motion are illustrative.
36 is the [Kr] core total across four shells.
At a glance
- Atomic number
- 43
- Atomic mass
- 98 u
- Phase
- Solid
- Density
- 11 g/cm³
- Melting point
- 2,430 K
- Boiling point
- 4,538 K
- First ionization energy
- 702 kJ/mol
- Electronegativity
- 1.9
- Electron affinity
- 53 kJ/mol
- Molar heat capacity
- 24.27 J/(mol·K)
- Period
- 5
- Appearance
- shiny gray metal
Conditions and isotopes affect measured properties. Some properties of short-lived elements are predicted. Electronegativity uses the Pauling scale.
Keep exploring
Explore the stories, imagery, and reference data in more depth. Properties with no value in the reference are marked unavailable.