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.
Experiment with the elements
Technetium doesn't form any compounds in our lab yet, but the periodic table sandbox lets you combine dozens of other real elements into real compounds — water, table salt, ammonia and many more — with their true chemical formulas.