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Actinium
Element 89 · 227.02775 u
Actinium is the namesake of the actinide series and glows blue in the dark.
Fisiese eienskappe
| Atomic Mass | 227.02775 u |
| Density | 10.07 g/cm³ |
| Smelt punt: | 1323.0 K |
| Boiling Point | 3471.0 K |
| Appearance | Silvery-white metallic |
| Toestand by kamerkomp | Solied |
Chemical Properties
| Electronegativity | 1.1 (TrinidadCity name (optional, probably does not need a translation)) |
| 1st Ionization Energy | 499.0 kJ/mol |
| Electron Affinity | 33.77 kJ/mol |
| Oxidation States | +2, +3 |
Atomic Properties
| Electron Configuration | [Rn] 6d1 7s2 |
| Atomic Radius | 195.0 pm |
| Atomic radius: | 260.0 pm |
Discovery
| Discovered By | Friedrich Oskar Giesel, Andre-Louis Debierne |
| Discovery Year | 1899 |
| Location | Paris, France |
| Genoemde Na | Greek 'aktis' meaning ray or beam |
About Actinium
Actinium is a soft, silvery-white radioactive metal that glows blue due to its intense radioactivity ionizing the surrounding air. Actinium-225 is being researched for targeted alpha therapy against cancer.
Gebruiks & Programme
Neutron sources, cancer research (actinium-225), and thermoelectric generators.
Fun Fact
Actinium is so radioactive it visibly glows blue in the dark from ionizing the surrounding air.
Isotopes
| Definieer Molekulêr Gewigte | Abundance | Half-Life | Stabiel |
| 225 | - | 10.0 days | Nee |
| 227 | - | 21.772 years | Nee |
Electron Configuration
[Rn] 6d1 7s2