|
87
Fr
223
Francium |
Appearance & Characteristics | Reactions |
Other Forms Radius | Conductivity | Abundance
General:
| Name: Francium | Symbol: Fr |
| Group: Alkali Met. | Atomic weight: 223 |
| Density @ 293 K: ? | Atomic volume: ? |
| Group: Alkali Met. | Discovered: 1939 |
States
| State (s, l, g): solid | |
| Melting point: 300 K (27 oC) | Boiling point: 950 K (677 oC) |
| Heat of fusion: ? | Heat of vaporization: ? |
Energies
| 1st ionization energy: 384 kJ/mole | |
| Electronegativity: 0.7 | 2nd ionization energy: kJ/mole |
| Electron affinity: kJ/mole | 3rd ionization energy: kJ/mole |
| Specific heat: ? | Heat atomization: 73 kJ/mole atoms |
Oxidation & Electrons
| Shells: 2,8,18,32,18,8,1 | Electron configuration: [Rn] 7s1 |
| Minimum oxidation number: 0 | Maximum oxidation number: 1 |
| Min. common oxidation no.: 0 | Max. common oxidation no.: 1 |
Appearance & Characteristics
| Structure: | Color: |
| Uses: | Toxicity: |
| Hardness: mohs | Characteristics: Radioactive, melts near room temp. |
Reactions
| Reaction with air: | |
| Reaction with 6 M HCl: vigorous, => H2, FrCl | Reaction with 6 M HCl: vigorous, => H2, FrCl |
| Reaction with 15 M HNO3: | Reaction with 6 M NaOH: vigorous, => H2, FrOH |
Other Forms
| Number of isotopes: 1 | Hydride(s): |
| Oxide(s): | Chloride(s): |
Radius
| Ionic radius (2- ion): pm | Ionic radius (1- ion): pm |
| Atomic radius: pm | Ionic radius (1+ ion): 194 pm |
| Ionic radius (2+ ion): pm | Ionic radius (3+ ion): pm |
Conductivity
| Thermal conductivity: J/m-sec-deg | |
| Electrical conductivity: 1/mohm-cm | Polarizability: 48.7 A^3 |
Abundance
| Source: Synthetic(U-235 decay) | |
| Rel. abund. solar system: log | Abundance earth's crust: log |
| cost, pure: $/100g | cost, bulk: $/100g |
