| TECHNETIUM | 43Tc |
|---|---|
| Appearance | Technetiun is a silvery-grey metal that tarnishes slowly in moisture. It usually comes as a great powder. |
| Discovery | 1937 by C. Perrier and E.G. Segre In Palermo, Italy. It was the first element to be produced artificially. |
| Electronic Configuration | simple: 2.8.18.13.2 ADVANCED: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d5 5s2 or [Kr] 3d10 4s2 4p6 4d5 5s2 for short. |
| Isotopes | No isotope is naturally abundant. All are made artificially. 97Tc has a half-life of 2.6 million years: 98Tc has a half-life of 1.5 million years and 99Tc Has a half-life of 212000 years. |
| Source | The metal is produced in tonne quantities from the fission products of uranium nuclear fuel. |
| Common uses | Technetium is a marvellous corrosion-inhibitor for steel, and can protect steel by the addition of very small amounts. However, as technetium is radioactive, this use is limited to close systems. |
| Test | - |
| Melting point in Kelvin | 2445 |
| Boiling point in Kelvin | 5150 |
| Density in kg/m3 | 1150 at 293K |
| Oxidation States | -1 0 +4 +5 +6 and +7 but mostly +4 +5 and +7 |
| Electron Affinity in kJmol-1 | 96 |
| IE1 in kJmol-1 | 702 |
| IE2 in kJmol-1 | 1472 |
| IE3 in kJmol-1 | 2850 |
| IE4 in kJmol-1 | 4100 |
| IE5 in kJmol-1 | 5700 |
| IE6 in kJmol-1 | 7300 |
| IE7 in kJmol-1 | 9100 |
| IE8 in kJmol-1 | 15600 |
| IE9 in kJmol-1 | 17800 |
| IE10 in kJmol-1 | 19900 |
| Enthalpy of Fusion in kJmol-1 | 23.81 |
| Enthalpy of Vaporisation in kJmol-1 | 585.22 |