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rubidium vs cesium

Input interpretation

rubidium (chemical element) | cesium (chemical element)
rubidium (chemical element) | cesium (chemical element)

Periodic table location

Periodic table location
Periodic table location

Images

Images
Images

Basic elemental properties

| rubidium | cesium atomic symbol | Rb | Cs atomic number | 37 | 55 short electronic configuration | [Kr]5s^1 | [Xe]6s^1 Aufbau diagram | 5s | 6s block | s | s group | 1 | 1 period | 5 | 6 atomic mass | 85.4678 u | 132.90545196 u half-life | (stable) | (stable)
| rubidium | cesium atomic symbol | Rb | Cs atomic number | 37 | 55 short electronic configuration | [Kr]5s^1 | [Xe]6s^1 Aufbau diagram | 5s | 6s block | s | s group | 1 | 1 period | 5 | 6 atomic mass | 85.4678 u | 132.90545196 u half-life | (stable) | (stable)

Thermodynamic properties

| rubidium | cesium phase at STP | solid | solid melting point | 39.31 °C | 28.44 °C boiling point | 688 °C | 671 °C critical temperature | 2093 K | 1938 K critical pressure | 16 MPa | 9.4 MPa molar heat of fusion | 2.19 kJ/mol | 2.09 kJ/mol molar heat of vaporization | 72 kJ/mol | 65 kJ/mol specific heat at STP | 364 J/(kg K) | 242 J/(kg K) (properties at standard conditions)
| rubidium | cesium phase at STP | solid | solid melting point | 39.31 °C | 28.44 °C boiling point | 688 °C | 671 °C critical temperature | 2093 K | 1938 K critical pressure | 16 MPa | 9.4 MPa molar heat of fusion | 2.19 kJ/mol | 2.09 kJ/mol molar heat of vaporization | 72 kJ/mol | 65 kJ/mol specific heat at STP | 364 J/(kg K) | 242 J/(kg K) (properties at standard conditions)

Material properties

| rubidium | cesium density | 1.532 g/cm^3 | 1.879 g/cm^3 liquid density | 1.46 g/cm^3 | 1.843 g/cm^3 molar volume | 55.79 cm^3/mol | 70.73 cm^3/mol Mohs hardness | 0.3 (between talc and gypsum) | 0.2 (between talc and gypsum) Brinell hardness | 0.216 MPa | 0.14 MPa bulk modulus | 2.5 GPa | 1.6 GPa Young's modulus | 2.4 GPa | 1.7 GPa sound speed | 1300 m/s | thermal conductivity | 58 W/(m K) | 36 W/(m K) (properties at standard conditions)
| rubidium | cesium density | 1.532 g/cm^3 | 1.879 g/cm^3 liquid density | 1.46 g/cm^3 | 1.843 g/cm^3 molar volume | 55.79 cm^3/mol | 70.73 cm^3/mol Mohs hardness | 0.3 (between talc and gypsum) | 0.2 (between talc and gypsum) Brinell hardness | 0.216 MPa | 0.14 MPa bulk modulus | 2.5 GPa | 1.6 GPa Young's modulus | 2.4 GPa | 1.7 GPa sound speed | 1300 m/s | thermal conductivity | 58 W/(m K) | 36 W/(m K) (properties at standard conditions)

Electromagnetic properties

| rubidium | cesium electrical type | conductor | conductor resistivity | 1.2×10^-7 Ω m (ohm meters) | 2×10^-7 Ω m (ohm meters) electrical conductivity | 8.3×10^6 S/m (siemens per meter) | 5×10^6 S/m (siemens per meter) magnetic type | paramagnetic | paramagnetic volume magnetic susceptibility | 3.98×10^-6 | 5.26×10^-6 mass magnetic susceptibility | 2.6×10^-9 m^3/kg (cubic meters per kilogram) | 2.8×10^-9 m^3/kg (cubic meters per kilogram) molar magnetic susceptibility | 2.22×10^-10 m^3/mol (cubic meters per mole) | 3.72×10^-10 m^3/mol (cubic meters per mole) work function | 2.26 eV (Polycrystalline) | 1.95 eV (Polycrystalline) threshold frequency | 5.467×10^14 Hz (hertz) | 4.715×10^14 Hz (hertz) color | (silver) | (yellow)
| rubidium | cesium electrical type | conductor | conductor resistivity | 1.2×10^-7 Ω m (ohm meters) | 2×10^-7 Ω m (ohm meters) electrical conductivity | 8.3×10^6 S/m (siemens per meter) | 5×10^6 S/m (siemens per meter) magnetic type | paramagnetic | paramagnetic volume magnetic susceptibility | 3.98×10^-6 | 5.26×10^-6 mass magnetic susceptibility | 2.6×10^-9 m^3/kg (cubic meters per kilogram) | 2.8×10^-9 m^3/kg (cubic meters per kilogram) molar magnetic susceptibility | 2.22×10^-10 m^3/mol (cubic meters per mole) | 3.72×10^-10 m^3/mol (cubic meters per mole) work function | 2.26 eV (Polycrystalline) | 1.95 eV (Polycrystalline) threshold frequency | 5.467×10^14 Hz (hertz) | 4.715×10^14 Hz (hertz) color | (silver) | (yellow)

Reactivity

| rubidium | cesium valence | 1 | 1 electronegativity | 0.82 | 0.79 electron affinity | 46.9 kJ/mol (kilojoules per mole) | 45.5 kJ/mol (kilojoules per mole) first ionization energy | 403 kJ/mol (kilojoules per mole) | 375.7 kJ/mol (kilojoules per mole) ionization energies | 403 kJ/mol | 2633 kJ/mol | 3860 kJ/mol | 5080 kJ/mol | 6850 kJ/mol | 8140 kJ/mol | 9570 kJ/mol | 13120 kJ/mol | 14500 kJ/mol | 26740 kJ/mol | 375.7 kJ/mol | 2234.3 kJ/mol | 3400 kJ/mol
| rubidium | cesium valence | 1 | 1 electronegativity | 0.82 | 0.79 electron affinity | 46.9 kJ/mol (kilojoules per mole) | 45.5 kJ/mol (kilojoules per mole) first ionization energy | 403 kJ/mol (kilojoules per mole) | 375.7 kJ/mol (kilojoules per mole) ionization energies | 403 kJ/mol | 2633 kJ/mol | 3860 kJ/mol | 5080 kJ/mol | 6850 kJ/mol | 8140 kJ/mol | 9570 kJ/mol | 13120 kJ/mol | 14500 kJ/mol | 26740 kJ/mol | 375.7 kJ/mol | 2234.3 kJ/mol | 3400 kJ/mol
Reactivity
Reactivity

Atomic properties

| rubidium | cesium term symbol | ^2S_(1/2) | ^2S_(1/2) atomic radius | 235 pm | 260 pm covalent radius | 220 pm | 244 pm (electronic ground state properties)
| rubidium | cesium term symbol | ^2S_(1/2) | ^2S_(1/2) atomic radius | 235 pm | 260 pm covalent radius | 220 pm | 244 pm (electronic ground state properties)

Abundances

| rubidium | cesium universe abundance | 1×10^-6 mass% | 8×10^-8 mass% solar abundance | 3×10^-6 mass% | 8×10^-7 mass% meteorite abundance | 3.2×10^-4 mass% | 1.4×10^-5 mass% crust abundance | 0.006 mass% | 1.9×10^-4 mass% ocean abundance | 1.2×10^-5 mass% | 5×10^-8 mass% human abundance | 4.6×10^-4 mass% | 2×10^-6 mass% universe molar abundance | 1×10^-8 mol% | 1×10^-9 mol% solar molar abundance | 4×10^-8 mol% | 7×10^-9 mol% meteorite molar abundance | 7.8×10^-5 mol% | 2×10^-6 mol% ocean molar abundance | 8.7×10^-7 mol% | 2.3×10^-9 mol% crust molar abundance | 0.0014 mol% | 2.9×10^-5 mol% human molar abundance | 3.4×10^-5 mol% | 1×10^-7 mol%
| rubidium | cesium universe abundance | 1×10^-6 mass% | 8×10^-8 mass% solar abundance | 3×10^-6 mass% | 8×10^-7 mass% meteorite abundance | 3.2×10^-4 mass% | 1.4×10^-5 mass% crust abundance | 0.006 mass% | 1.9×10^-4 mass% ocean abundance | 1.2×10^-5 mass% | 5×10^-8 mass% human abundance | 4.6×10^-4 mass% | 2×10^-6 mass% universe molar abundance | 1×10^-8 mol% | 1×10^-9 mol% solar molar abundance | 4×10^-8 mol% | 7×10^-9 mol% meteorite molar abundance | 7.8×10^-5 mol% | 2×10^-6 mol% ocean molar abundance | 8.7×10^-7 mol% | 2.3×10^-9 mol% crust molar abundance | 0.0014 mol% | 2.9×10^-5 mol% human molar abundance | 3.4×10^-5 mol% | 1×10^-7 mol%

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