Fr
| Group | group 1: hydrogen and alkali metals | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Boiling point | ? 950 K (? 677 °C, ? 1250 °F) | ||||||||||||||
| Phase at STP | ของแข็ง presumably | ||||||||||||||
| Electronegativity | Pauling scale: >0.79 | ||||||||||||||
| Heat of fusion | ca. 2 kJ/mol | ||||||||||||||
| Naming | ตาม ประเทศฝรั่งเศส บ้านเกิดของผู้ค้นพบ | ||||||||||||||
| Heat of vaporization | ca. 65 kJ/mol | ||||||||||||||
| P (Pa)1101001 k10 k100 kat T (K) | Vapor pressure (extrapolated)
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| Thermal conductivity | 15 (extrapolated) W/(m⋅K) | ||||||||||||||
| Electron configuration | [Rn] 7s1 | ||||||||||||||
| Van der Waals radius | 348 (extrapolated) pm | ||||||||||||||
| Crystal structure | รูปลูกบาศก์กลางตัว (extrapolated) |
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| Pronunciation | /ˈfrænsiəm/ (FRAN-see-əm) | ||||||||||||||
| Magnetic ordering | พาราแมกเนติก | ||||||||||||||
| Oxidation states | +1 (a strongly basic oxide) | ||||||||||||||
| Discovery | มาร์เกอไรต์ เปเรย์ (1939) | ||||||||||||||
| Period | period 7 | ||||||||||||||
| CAS Number | 7440-73-5 | ||||||||||||||
| Electrons per shell | 2, 8, 18, 32, 18, 8, 1 | ||||||||||||||
| First isolation | มาร์เกอไรต์ เปเรย์ (1939) | ||||||||||||||
| Natural occurrence | from decay | ||||||||||||||
| Electrical resistivity | 3 µ (calculated) Ω⋅m | ||||||||||||||
| Mass number | [223] | ||||||||||||||
| Density (near r.t.) | ? 1.87 (extrapolated) g/cm3 | ||||||||||||||
| at T (K) | 404 | ||||||||||||||
| Block | s-block | ||||||||||||||
| Covalent radius | 260 (extrapolated) pm | ||||||||||||||
| Melting point | ? 300 K (? 27 °C, ? 80 °F) |
