 |
| General |
| Name | Francium |
| Symbol | Fr |
| Number | 87 |
| Group Number | 1 |
| Group | Alkali metals |
| Block | s |
| Density | Nil |
| Atomic Weight | 223 g/mol |
| Atomic Volume | Nil |
| Discover | 1939 |
|
| States |
| State | Solid |
| Melting Point | 300 K |
| Boiling Point | 950 K |
| Triple Point | Nil |
| Critical Point | Nil |
| Heat of Fusion | 2 kJ/mol |
| Heat of Vaporization | 65 kJ/mol |
|
| Energies |
| First Ionization Energy | 384 kJ/mole |
| Second Ionization Energy | Nil |
| Third Ionization Energy | Nil |
| Electronegativity | 0.7 |
| Electron Affinity | Nil |
| Specific Heat | Nil |
| Heat Atomization | 73 kJ/mole atoms |
|
| Oxidation and Electrons |
| Shells | 2,8,18,32,18,8,1 |
| Electron Configuration | [Rn] 7s1 |
| Minimum Oxidation Number | 0 |
| Maximum Oxidation Number | 1 |
| Minimum Common Oxidation Number | 0 |
| Maximum Common Oxidation Number | 1 |
|
| Appearance and Characteristics |
| Crystal Structure | cubic body centered |
| Characteristics | Radioactive |
| Color | Nil |
| Uses | Nil |
| Hardness | Nil |
| Toxicity | None |
|
| Reactions |
| Reaction with Air | None |
| Reaction with 6M HCl | vigorous, =>H2, FrCl |
| Reaction with 15M HNO3 | None |
| Reaction with 6M NaOH | vigorous, =>H2, FrOH |
|
| Other Forms |
| Number of Isotopes | 1 |
| Hydride | None |
| Oxide | None |
| Chloride | None |
|
| Radius |
| Atomic Radius | Nil |
| Ionic Radius (1+ ion) | 194 pm |
| Ionic Radius (1- ion) | Nil |
| Ionic Radius (2+ ion) | Nil |
| Ionic Radius (2- ion) | Nil |
| Ionic Radius (3+ ion) | Nil |
|
| Conductivity |
| Thermal Conductivity | Nil |
| Electrical Conductivity | Nil |
| Polarizability | 48.7 A3 |
|
| Abundance |
| Source | Synthetic(U-235 decay) |
| Relation Abundance Solar System | Nil |
| Abundance Earth's Crust | Nil |
|
