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Atomic mass, symbol and atomic number
technetium is a naturally occurring element with the element symbol Tc and the ordinal number 43. In the periodic table it stands with an atomic mass of 98.906 u in the 7th subgroup. The chemical element discovered by Emilio Segrè in 1937 is radioactive and is in a solid state of aggregation at room temperature.
Profile: Technetium (English Technetium)
| General | |
|---|---|
| Chemical element: | technetium |
| Symbol: | tc |
| Atomic number: | 43 |
| Group: | Manga group |
| Period: | 5 |
| Block: | d-block |
| Series: | Transition metals |
| Appearance: | silvery to greyish |
| explorers: | Emilio Segrè |
| Year of discovery: | 1937 |
| Atomic properties | |
| Atomic mass: | 98,906 u |
| Atomic radius: | 135 pm |
| Covalent radius: | 147 pm |
| Van der Waals radius: | unknown |
| Electron configuration: | Kr 4d5 5s2 |
| ionization: | 702 kJ / mol |
| Physical Properties | |
| Physical state: | firmly |
| Density: | ??? |
| Crystal structure: | hexagonal |
| Magnetism: | paramagnetic |
| molar volume: | 8,63 · 10-6 m3/ mol |
| Mohs hardness: | ??? |
| Melting point: | 2157 ° C |
| Boiling point: | 4265 ° C |
| Heat of fusion: | 23 kJ / mol |
| Heat of vaporization: | 550 kJ / mol |
| Thermal conductivity: | 51 W |
| Chemical properties | |
| electronegativity: | 1,9 |
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