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| Americium | Américium | Americij | Americio | Americium | ||||||||||||||||||||
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Am Americium |
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- Americium was discovered by Glenn T. Seaborg, Ralph A. James, Stanley G. Thompson and Albert Ghiorso (USA) in 1944. Named for the American continent. It is silvery-white, artificially produced radioactive metal.
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TRANSITION ELEMENT: ACTINIDE | |
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| Relative atomic mass: | [243] | Electronic configuration: | [Rn] 5f7 7s2 |
| Formal oxidation number: | +3 +4 +5 +6 | Electronegativities: | - |
| Thermal conductivity: | 10 W m-1 K-1 | Electrical resistivity (20 °C): | 68 μΩcm |
| Atomic radius: | 173 pm | Standard state (20 °C): | solid |
| Density (g dm-3): | 13670 (293 K) | Molar volume (cm3 mol-1): | 17.78 (293 K) |
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THERMAL PROPERTIES | |
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| Melting point: | 1176 °C | Heat of fusion: | 14.4 kJ mol-1 |
| Boiling point: | 2011 °C | Heat of vaporization: | 238.5 kJ mol-1 |
| Critical temperature: | 10527 °C | Heat of atomization: | 266 kJ mol-1 |
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IONIZATION ENERGIES AND ABUNDANCE | |
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| 1st ionization energy: | 576.39 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 |
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ISOTOPES | |
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Isotopes | Relative atomic mass | Abundance (%) |
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MINERALS AND USES | |
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- Americium was produced by bombarding plutonium with neutrons. Americium-241 is currently used in smoke detectors.
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REDUCTION POTENTIALS | |
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Balanced half-reaction | Eo / V | Annotation |
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