Technétium (Tc)
Technétium is the chemical element with atomic number 43 and symbol Tc. It is a métal de transition in period 5, group 7, with a standard atomic weight of 98 u.
Faits essentiels
- Z
- 43
- Atomic weight
- 98 u no stable isotope
- Category
- métal de transition
- State at 298 K
- Solid
- Occurrence
- from decay, radioactive
- Discovered
- 1937
- CAS
- 7440-26-8
Propriétés mesurées
| Property | Value | Source |
|---|---|---|
| Electronegativity | 1.9 | National Center for Biotechnology Information (NIH) |
| Melting point | 2,430 K | National Center for Biotechnology Information (NIH) |
| Boiling point | 4,538 K | National Center for Biotechnology Information (NIH) |
| Density stp | 11 g/cm³ | National Center for Biotechnology Information (NIH) |
| Atomic radius empirical | 209 pm | National Center for Biotechnology Information (NIH) |
| Ionization energy 1st | 702.4 kJ/mol | National Center for Biotechnology Information (NIH) |
| Electron affinity | 53.1 kJ/mol | National Center for Biotechnology Information (NIH) |
Configuration électronique
- Noble gas notation
- [Kr] 4d⁵ 5s²
- Full notation
- 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d⁵ 5s²
- Electrons per shell
- 2, 8, 18, 13, 2