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43
Tc
98.9062
Technetium |
Appearance & Characteristics | Reactions |
Other Forms Radius | Conductivity | Abundance
General:
| Name: Technetium | Symbol: Tc |
| Group: Trans. Met. | Atomic weight: 98.9062 |
| Density @ 293 K: 11.5 g/cm3 | Atomic volume: 8.5 cm3/mol |
| Group: Trans. Met. | Discovered: 1939 |
States
| State (s, l, g): solid | |
| Melting point: 2445.2 K | Boiling point: 4840 K |
| Heat of fusion: 24.0 kJ/mol | Heat of vaporization: 660.0 kJ/mol |
Energies
| 1st ionization energy: 702.4 kJ/mole | |
| Electronegativity: 1.9 | 2nd ionization energy: 1472.4 kJ/mole |
| Electron affinity: 53 kJ/mole | 3rd ionization energy: 2850.2 kJ/mole |
| Specific heat: 0.21 J/gK | Heat atomization: 677 kJ/mole atoms |
Oxidation & Electrons
| Shells: 2,8,18,14,1 | Electron configuration: [Kr] 4d5 5s2 |
| Minimum oxidation number: -3 | Maximum oxidation number: 7 |
| Min. common oxidation no.: 0 | Max. common oxidation no.: 7 |
Appearance & Characteristics
| Structure: hcp: hexagonal close pkd | Color: silvery gray |
| Uses: medical imaging agents | Toxicity: |
| Hardness: mohs | Characteristics: Radioactive, man-made |
Reactions
| Reaction with air: mild, w/ht, => Tc2O7 | |
| Reaction with 6 M HCl: none | Reaction with 6 M HCl: none |
| Reaction with 15 M HNO3: mild, => HTcO4 | Reaction with 6 M NaOH: |
Other Forms
| Number of isotopes: 0 | Hydride(s): none |
| Oxide(s): TcO2 Tc2O7 | Chloride(s): TcCl4 |
Radius
| Ionic radius (2- ion): pm | Ionic radius (1- ion): pm |
| Atomic radius: 136 pm | Ionic radius (1+ ion): pm |
| Ionic radius (2+ ion): pm | Ionic radius (3+ ion): pm |
Conductivity
| Thermal conductivity: 50.6 J/m-sec-deg | |
| Electrical conductivity: 1/mohm-cm | Polarizability: 11.4 A^3 |
Abundance
| Source: Synthetic (U fission) | |
| Rel. abund. solar system: log | Abundance earth's crust: log | cost, pure: $/100g | cost, bulk: $/100g |
