| Francium |
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87Fr |
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| Panagway |
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| Unknown, but probably metallic |
| Kinatibuk-ang mga kinaiya |
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| Ngalan,simbolo,kaiphan | francium, Fr, 87 |
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| Paglitok | /ˈfrænsiəm/
[[Help:Pronunciation respelling key|Plantilya:Smallcaps all-see-əm]] |
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| Kategoriyang elemento | puthaw |
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| Group,period,block | 1, 7,s |
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| Gibug-aton sa atomo | (223) |
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| Kontorno sa elektron | [Rn] 7s1
2, 8, 18, 32, 18, 8, 1 Electron shells of francium (2, 8, 18, 32, 18, 8, 1) |
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| History |
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| Pagkadiskobre | Marguerite Perey (1939) |
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| First isolation | Marguerite Perey (1939) |
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| Physical properties |
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| Phase | magahi presumably |
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| Density (nearr.t.) | ? 1.87(extrapolated) g·cm−3 |
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| Melting point | ? 300 K, ? 27 °C, ? 80 °F |
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| Boiling point | ? 950 K, ? 677 °C, ? 1250 °F |
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| Heat of fusion | ca. 2kJ·mol−1 |
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| Heat of vaporization | ca. 65 kJ·mol−1 |
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| Vapor pressure (extrapolated) |
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| P (Pa) | 1 | 10 | 100 | 1 k | 10 k | 100 k | | at T (K) | 404 | 454 | 519 | 608 | 738 | 946 |
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| Atomic properties |
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| Oxidation states | 1 (stronglybasic oxide) |
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| Electronegativity | 0.7 (Pauling scale) |
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| Ionization energies | 1st: 380 kJ·mol−1 |
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| Covalent radius | 260(extrapolated) pm |
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| Van der Waals radius | 348(extrapolated) pm |
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| Miscellanea |
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| Crystal structure | cubic body-centered(extrapolated) |
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| Magnetic ordering | Paramagnetic |
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| Electrical resistivity | 3 µ(calculated)Ω·m |
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| Thermal conductivity | 15(extrapolated) W·m−1·K−1 |
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| CAS registry number | 7440-73-5 |
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| Most stable isotopes |
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| Main article:Isotopes of francium |
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| ·r |
