|
|
|
|
| |||||||||||||||||||||||||||||||||||
Elektronische Daten | Thermische Daten | Sterische Daten | ||
|---|---|---|---|---|
|
Schalen: 2,8,18,32,18,8,2 Orbitale: [Rn] 7s2 Elektronegativität: 1.0, 0.9 1. Ionization potential: 5.2789 eV 2. Ionization potential: 10.148 eV 3. Ionization potential: -- eV Oxidation states: 2 Electrical conductivity: -- |
Melting point: 700 °C Boiling point: 1140 °C Specific heat: 0.12 J/gK Heat of fusion: -- kJ/mol Heat of vaporization: -- kJ/mol Thermal conductivity: 0.186 W/cmK |
Atomic radius: -- Å Ionic radius: 1.62 Å () Covalent radius: -- Å Atomic volume: 45.20 cm³/mol Density (293 K): 5 g/cm³ Crystal structure: Kubisch körperzentriert |
| Legende Taschenrechner |
| Nuklid | Häufigkeit [%] | Masse | Spin | Halbwertszeit | Zerfallsmodus | Zerfallsreihe |
| 222Ra | 0 | 222 | 0 | 38.0s | View | |
| 223Ra | 0 | 223.019 | 1/2 | 11.435d | View | |
| 224Ra | 0 | 224.02 | 0 | 3.66d | View | |
| 225Ra | 0 | 225 | 1/2 | 14.9d | View | |
| 226Ra | 0 | 226.025 | 0 | 1.6E03y | View | |
| 228Ra | 0 | 228 | 0 | 5.76y | View |
| Legende |
| Herkunft des Namen: | latein: |
| Beschreibung: | Silvery-white metal. Intensely radioactive. |
| Entdeckt von: | Pierre und Marie Curie |
| Jahr: | 1898 |
| Ort: | Frankreich |
| Quelle(n): | Found in uranium ores at 1 part per 3 million parts uranium. |
| Verwendung(en): | Used in treating cancer because of the gamma rays it gives off. |
| © 2000 Information | Fehlermeldung schicken | ChemGlobe |