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Francium
Chemical Properties & Compounds
| Symbol | Atomic Number | Atomic Weight | Melting Point | Boiling Point | Phase | Density | Classification |
| Fr | 87 | 223 | 27 °C | 677 °C | Solid | 1.87 g/cm3 | Alkali Metal  |
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| General |
| 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 |
| Electron configuration |
[Rn] 7s1 |
| 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 |
? 300 K
(27 °C, 80 °F) |
| Boiling point |
? 950 K
(? 677 °C, ? 1250 °F) |
| Heat of fusion |
ca. 2 kJ·mol−1 |
| Heat of vaporization |
ca. 65 kJ·mol−1 |
Vapor pressure (extrapolated)
| P(Pa) |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T(K) |
404 |
454 |
519 |
608 |
738 |
946 |
|
| Atomic properties |
| Crystal structure |
? cubic body centered |
| Oxidation states |
1
(strongly basic oxide) |
| Electronegativity |
0.7 (scale Pauling) |
| Ionization energies |
1st: 380 kJ/mol |
| Miscellaneous |
| Magnetic ordering |
? |
| Electrical resistivity |
? 3 µΩ·m |
| Thermal conductivity |
(300 K) ? 15 W·m−1·K−1 |
| CAS registry number |
7440-73-5 |
| Selected isotopes |
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| References |
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Francium Compounds
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Source: Wikipedia article Francium
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Chemistry Quick Facts