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|
Technetium
Chemical Properties & Compounds
| Symbol | Atomic Number | Atomic Weight | Melting Point | Boiling Point | Phase | Density | Classification |
| Tc | 43 | 98 | 2157 °C | 4265 °C | Solid | 11g/cm3 | Metal  |
|
|
|
| General |
| Name, Symbol, Number |
technetium, Tc, 43 |
| Chemical series |
transition metals |
| Group, Period, Block |
7, 5, d |
| Appearance |
silvery gray metal
 |
| Standard atomic weight |
[98](0) g·mol−1 |
| Electron configuration |
[Kr] 4d5 5s2 |
| Electrons per shell |
2, 8, 18, 13, 2 |
| Physical properties |
| Phase |
solid |
| Density (near r.t.) |
11 g·cm−3 |
| Melting point |
2430 K
(2157 °C, 3915 °F) |
| Boiling point |
4538 K
(4265 °C, 7709 °F) |
| Heat of fusion |
33.29 kJ·mol−1 |
| Heat of vaporization |
585.2 kJ·mol−1 |
| Heat capacity |
(25 °C) 24.27 J·mol−1·K−1 |
Vapor pressure (extrapolated)
| P(Pa) |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T(K) |
2727 |
2998 |
3324 |
3726 |
4234 |
4894 |
|
| Atomic properties |
| Crystal structure |
hexagonal |
| Oxidation states |
7
(strongly acidic oxide) |
| Electronegativity |
1.9 (scale Pauling) |
| Electron affinity |
-53 kJ/mol |
| Ionization energies |
1st: 702 kJ/mol |
| 2nd: 1470 kJ/mol |
| 3rd: 2850 kJ/mol |
| Atomic radius |
135 pm |
| Atomic radius (calc.) |
183 pm |
| Covalent radius |
156 pm |
| Miscellaneous |
| Magnetic ordering |
Paramagnetic |
| Thermal conductivity |
(300 K) 50.6 W·m−1·K−1 |
| CAS registry number |
7440-26-8 |
| Selected isotopes |
|
|
| References |
|
Technetium Compounds
|
Source: Wikipedia article Technetium
|
|
Chemistry Quick Facts
