Tc
Technetium
Element 43 · 98.0 u
Technetium was the first artificially produced element and has no stable isotopes.
Physical Properties
| Atomic Mass | 98.0 u |
| Density | 11.5 g/cm³ |
| Melting Point | 2430.0 K |
| Boiling Point | 4538.0 K |
| Appearance | Shiny gray metallic |
| State at Room Temp | Solid |
Chemical Properties
| Electronegativity | 1.9 (Pauling) |
| 1st Ionization Energy | 702.0 kJ/mol |
| Electron Affinity | 53.0 kJ/mol |
| Oxidation States | +1, +2, +3, +4, +5, +6, +7 |
Atomic Properties
| Electron Configuration | [Kr] 4d5 5s2 |
| Atomic Radius | 136.0 pm |
| Covalent Radius | 147.0 pm |
| Van der Waals Radius | 209.0 pm |
Discovery
| Discovered By | Carlo Perrier, Emilio Segre |
| Discovery Year | 1937 |
| Location | Palermo, Italy |
| Named After | Greek 'technetos' meaning artificial |
About Technetium
Technetium is a silvery-gray radioactive metal. It was the first element produced artificially, by bombarding molybdenum with deuterons. Technetium-99m is the most widely used isotope in medical diagnostic imaging.
Uses & Applications
Medical imaging (Tc-99m in SPECT scans), nuclear medicine diagnostics, and steel corrosion inhibitor.
Fun Fact
Technetium was the first artificially created element, and tiny traces have been found in nature from spontaneous uranium fission.
Isotopes
| Mass Number | Abundance | Half-Life | Stable |
| 97 | - | 4.21 million years | No |
| 98 | - | 4.2 million years | No |
| 99 | - | 211,100 years | No |
Electron Configuration
[Kr] 4d5 5s2