 |
| General |
| Name | Technetium |
| Symbol | Tc |
| Number | 43 |
| Group Number | 7 |
| Group | Transition metals |
| Block | d |
| Density | 11.5 g/cm3 |
| Atomic Weight | 98.9062 g/mol |
| Atomic Volume | 8.5 cm3/mol |
| Discover | 1939 |
|
| States |
| State | Solid |
| Melting Point | 2430 K |
| Boiling Point | 4538 K |
| Triple Point | Nil |
| Critical Point | Nil |
| Heat of Fusion | 33.29 kJ/mol |
| Heat of Vaporization | 585.2 kJ/mol |
|
| Energies |
| First Ionization Energy | 702.4 kJ/mole |
| Second Ionization Energy | 1472.4 kJ/mole |
| Third Ionization Energy | 2850.2 kJ/mole |
| Electronegativity | 1.9 |
| Electron Affinity | 53 kJ/mole |
| Specific Heat | 0.21 J/gK |
| Heat Atomization | 677 kJ/mole atoms |
|
| Oxidation and Electrons |
| Shells | 2,8,18,14,1 |
| Electron Configuration | [Kr] 4d5 5s2 |
| Minimum Oxidation Number | -3 |
| Maximum Oxidation Number | 7 |
| Minimum Common Oxidation Number | 0 |
| Maximum Common Oxidation Number | 7 |
|
| Appearance and Characteristics |
| Crystal Structure | hexagonal |
| Characteristics | Radioactive, man made |
| Color | silvery gray |
| Uses | medical imaging agents |
| Hardness | mohs |
| Toxicity | None |
|
| Reactions |
| Reaction with Air | mild, w/ht, =>Tc2O7 |
| Reaction with 6M HCl | None |
| Reaction with 15M HNO3 | mild, =>HTcO4 |
| Reaction with 6M NaOH | None |
|
| Other Forms |
| Number of Isotopes | 0 |
| Hydride | None |
| Oxide | TcO2 Tc2O7 |
| Chloride | TcCl4 |
|
| Radius |
| Atomic Radius | 136 pm |
| Ionic Radius (1+ ion) | Nil |
| Ionic Radius (1- ion) | Nil |
| Ionic Radius (2+ ion) | Nil |
| Ionic Radius (2- ion) | Nil |
| Ionic Radius (3+ ion) | Nil |
|
| Conductivity |
| Thermal Conductivity | 50.6 J/m-sec-deg |
| Electrical Conductivity | Nil |
| Polarizability | 11.4 A3 |
|
| Abundance |
| Source | Synthetic (U fission) |
| Relation Abundance Solar System | Nil |
| Abundance Earth's Crust | Nil |
|
