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55
Cs
132.9054
Cesium |
Appearance & Characteristics | Reactions |
Other Forms Radius | Conductivity | Abundance
General:
| Name: Cesium | Symbol: Cs |
| Group: Alkali Met. | Atomic weight: 132.9055 |
| Density @ 293 K: 1.873 g/cm3 | Atomic volume: 71.07 cm3/mol |
| Group: Alkali Met. | Discovered: 1860 |
States
| State (s, l, g): solid | |
| Melting point: 301.6 K (28.4 oC) | Boiling point: 943 K (670 oC) |
| Heat of fusion: 2.092 kJ/mol | Heat of vaporization: 67.740 kJ/mol |
Energies
| 1st ionization energy: 375.7 kJ/mole | |
| Electronegativity: 0.79 | 2nd ionization energy: 2421.8 kJ/mole |
| Electron affinity: 45.506 kJ/mole | 3rd ionization energy: kJ/mole |
| Specific heat: 0.24 J/gK | Heat atomization: 79 kJ/mole atoms |
Oxidation & Electrons
| Shells: 2,8,18,18,8,1 | Electron configuration: [Xe] 6s1 |
| Minimum oxidation number: 0 | Maximum oxidation number: 1 |
| Min. common oxidation no.: 0 | Max. common oxidation no.: 1 |
Appearance & Characteristics
| Structure: bcc: body-centered cubic | Color: yellow/silvery |
| Uses: photocells, IR lamps | Toxicity: |
| Hardness: 0.2 mohs | Characteristics: softest metal, melts near room temp. |
Reactions
| Reaction with air: vigorous, => CsO2 | |
| Reaction with 6 M HCl: vigorous, => H2, CsCl | Reaction with 6 M HCl: vigorous, => H2, CsCl |
| Reaction with 15 M HNO3: vigorous, => CsNO3 | Reaction with 6 M NaOH: vigorous, => H2, CsOH |
Other Forms
| Number of isotopes: 1 | Hydride(s): CsH |
| Oxide(s): Cs2O | Chloride(s): CsCl |
Radius
| Ionic radius (2- ion): pm | Ionic radius (1- ion): pm |
| Atomic radius: 265 pm | Ionic radius (1+ ion): 181 pm |
| Ionic radius (2+ ion): pm | Ionic radius (3+ ion): pm |
Conductivity
| Thermal conductivity: 35.9 J/m-sec-deg | |
| Electrical conductivity: 48.9 1/mohm-cm | Polarizability: 59.6 A^3 |
Abundance
| Source: Li extractn by-product | |
| Rel. abund. solar system: -0.429 log | Abundance earth's crust: 0 log |
| cost, pure: 1100 $/100g | cost, bulk: $/100g |
