- Atomic Mass: 132.9054
- Electronegativity:
- Pauling: 0.79
- Allred: 0.86
- Absolute: 2.18 eV
- Electron Affinity: 45.5 kJ mol-1
- Polarizability: 59.6 Å3
- Effective Nuclear Charge:
- Slater: 2.2
- Clementi: 6.36
- Froese Fischer: 8.56
- Radius:
- Cs 1 +: 165 pm
- Atomic: 265.4 pm
- Covalent: 235 pm
- Van der Waals: 262 pm
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- Successive Ionization Energies:
- Cs -› Cs + : 375.7 kJ mol-1
- Cs+1 -› Cs+2 : 2420 kJ mol-1
- Cs+2 -› Cs+3 : (3400) kJ mol-1
- Cs+3 -› Cs+4 : (4400) kJ mol-1
- Cs+4 -› Cs+5 : (6000) kJ mol-1
- Cs+5 -› Cs+6 : (7100) kJ mol-1
- Cs+6 -› Cs+7 : (8300) kJ mol-1
- Cs+7 -› Cs+8 : (11300) kJ mol-1
- Cs+8 -› Cs+9 : (12700) kJ mol-1
- Cs+9 -› Cs+10 : (23700) kJ mol-1
- Common Ions : Cs 1 +
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