Technetium (Tc) — Element 43: Properties & Data | Aladdin Scientific
Technetium(Tc) — Element 43
Technetium (Tc) is a transition metal with atomic number 43 and atomic mass 96.9064. It has melting point 2430 K (2157 °C), boiling point 4538 K (4265 °C), density 11 g/cm³. It sits in group 7 and period 5 of the periodic table and was discovered in 1937.
Key facts
| Atomic mass | 96.9064 u |
|---|---|
| Electron configuration | [Kr]5s2 4d5 |
| Oxidation states | +7, +6, +4 |
| Electronegativity (Pauling) | 1.9 |
| Atomic radius (van der Waals) | 209 pm |
| Ionization energy | 7.28 eV |
| Electron affinity | 0.55 eV |
| Melting point | 2430 K |
| Boiling point | 4538 K |
| Density | 11 g/cm³ |
| Standard state | Solid |
| Year discovered | 1937 |
Frequently asked questions
What is the electron configuration of technetium?
The ground-state electron configuration of technetium is [Kr]5s2 4d5.
What group and period is technetium in?
Technetium (Tc) is in group 7 and period 5 of the periodic table, classified as a transition metal.
What is the melting point of technetium?
Technetium melts at 2430 K (2157 °C).
What is the standard state of technetium?
Technetium is a solid at standard temperature and pressure.
Related elements
About this data: property values compiled from IUPAC Standard Atomic Weights (2021), the NIST Atomic Spectra Database, and PubChem. Curated by the Aladdin Scientific technical team. Last reviewed: .