Technetium
Transition Metal
Technetium (Tc) is a chemical element with atomic number 43, classified as a transition metal. At room temperature it is a solid. It was discovered in 1937 by Emilio Segrè, Carlo Perrier.
Properties
- Atomic number
- 43
- Atomic mass
- 98 u
- Category
- Transition Metal
- Group
- 7
- Period
- 5
- Block
- d-block
- Electron configuration
- [Kr] 4d⁵ 5s²
- Phase at STP
- Solid
- Density
- 11.5 g/cm³
- Melting point
- 2430 K (2156.8 °C)
- Boiling point
- 4538 K (4264.9 °C)
- Electronegativity
- 1.9
- Atomic radius
- 183 pm
- Ionization energy
- 7.28 eV
- Discovery
- 1937 · Emilio Segrè, Carlo Perrier
Common uses
Medical imaging, nuclear medicine, corrosion inhibitor
Did you know?
First artificially produced element and all isotopes are radioactive.