English
French
Croatian
German
Italian
|
||||||||||||||||||||||||
 |
|
|
||||||||||||||||||||||
|
||||||||||||||||||||||||
| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | R | S | T | U | V | X | Z | ||
|
||||||||||||||||||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
||||||||||||||||||||
| Dubnium | Dubnium | Dubnij | Dubnio | Dubnium | ||||||||||||||||||||
|
||||||||||||||||||||||||
|
Db Dubnium |
|
||||||||||||||||||||||||||||||
- Dubnium was discovered by workers at the Nuclear Institute at Dubna (USSR) and by workers at the University of California, Berkeley (USA) in 1967. The origin of the name dubnium is the Joint Nuclear Institute at Dubna, Russia, an institute heavily involved in the search for heavy elements. It is synthetic radioactive metal.
|
|
|
|
TRANSITION ELEMENT: VANADIUM GROUP | |
|
||
| Relative atomic mass: | [262] | Electronic configuration: | [Rn] 5f14 6d3 7s2 |
| Formal oxidation number: | Electronegativities: | - | |
| Thermal conductivity: | - W m-1 K-1 | Electrical resistivity (20 °C): | - μΩcm |
| Atomic radius: | - pm | Standard state (20 °C): | solid |
| Density (g dm-3): | - | Molar volume (cm3 mol-1): | - |
|
|
|
|
THERMAL PROPERTIES | |
|
||
| Melting point: | - °C | Heat of fusion: | - kJ mol-1 |
| Boiling point: | - °C | Heat of vaporization: | - kJ mol-1 |
| Critical temperature: | - °C | Heat of atomization: | - kJ mol-1 |
|
|
|
|
IONIZATION ENERGIES AND ABUNDANCE | |
|
||
| 1st ionization energy: | - kJ mol-1 | Abundance of element (air): | - ppm |
| 2nd ionization energy: | - kJ mol-1 | Abundance of element (Earth's crust): | - ppm |
| 3rd ionization energy: | - kJ mol-1 | Abundance of element (oceans): | - ppm |
|
|
|
|
ISOTOPES | |
|
||
|
Isotopes | Relative atomic mass | Abundance (%) |
|
|
||
|
|
|
|
MINERALS AND USES | |
|
||
- Dubnium was made by bombarding californium-249 with a beam of nitrogen-15 ions. There are now five known isotopes of dubnium. The longest-lived is dubnium-262, with a half-life of 34 seconds.
|
|
|
|
REDUCTION POTENTIALS | |
|
||
|
Balanced half-reaction | Eo / V | Annotation |
|
|
||
