Francium
Francium is a metallic chemical element (symbol Fr) with an atomic number of 87.
| General | |||||||||||||||
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| Name, Symbol, Number | francium, Fr, 87 | ||||||||||||||
| Chemical series | alkali metals | ||||||||||||||
| Group, Period, Block | 1, 7, s | ||||||||||||||
| Appearance | metallic | ||||||||||||||
| Standard atomic weight | (223) g·mol-1 | ||||||||||||||
| Electrons per shell | 2, 8, 18, 32, 18, 8, 1 | ||||||||||||||
| Physical properties | |||||||||||||||
| Phase | solid | ||||||||||||||
| Density (near r.t.) | 1.87 g·cm-3 | ||||||||||||||
| Melting point | 300K (27°C, 80°F) |
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| Boiling point | 950K (677°C, 1250°F) |
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| Heat of fusion | ca. 2 kJ·mol-1 | ||||||||||||||
| Heat of vaporization | ca. 65 kJ·mol-1 | ||||||||||||||
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| Atomic properties | |||||||||||||||
| Crystal structure | cubic body centered | ||||||||||||||
| Oxidation states | 1 (strongly basic oxide) |
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| Electronegativity | 0.7 (Pauling scale) | ||||||||||||||
| Ionization energies | 1st: 380 kJ/mol | ||||||||||||||
| Miscellaneous | |||||||||||||||
| Magnetic ordering | |||||||||||||||
| Electrical resistivity | 3 µΩ·m | ||||||||||||||
| Thermal conductivity | (300K) 15 W·m-1·K-1 | ||||||||||||||
| CAS registry number | 7440-73-5 | ||||||||||||||
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