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| Francium | Francium | Francij | Francio | Francium | ||||||||||||||||||||
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Fr Francium |
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- Francium was discovered by Marguerite Perey (France) in 1939. Named for France, the nation of its discovery. It is highly rare and unstable, radioactive metal. Chemical properties similar to cesium.
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ALKALI METAL | |
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| Relative atomic mass: | [223] | Electronic configuration: | [Rn] 7s1 |
| Formal oxidation number: | +1 | Electronegativities: | 0.7 |
| Thermal conductivity: | 15 W m-1 K-1 | Electrical resistivity (20 °C): | - μΩcm |
| Atomic radius: | 282 pm | Standard state (20 °C): | solid |
| Density (g dm-3): | - | Molar volume (cm3 mol-1): | - |
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THERMAL PROPERTIES | |
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| Melting point: | 27 °C | Heat of fusion: | - kJ mol-1 |
| Boiling point: | 677 °C | Heat of vaporization: | - kJ mol-1 |
| Critical temperature: | 1470 °C | Heat of atomization: | 75 kJ mol-1 |
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IONIZATION ENERGIES AND ABUNDANCE | |
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| 1st ionization energy: | 392.96 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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223Fr | 223.019731(3) | * |
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MINERALS AND USES | |
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- Francium is formed by decay of actinium. Produced by bombarding radium or astatine with neutrons. Since its isotopes have such short half-lives there are no commercially significant compounds of francium.
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REDUCTION POTENTIALS | |
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Balanced half-reaction | Eo / V | Annotation |
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