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cesium, barium

Input interpretation

cesium (chemical element) | barium (chemical element)
cesium (chemical element) | barium (chemical element)

Periodic table location

Periodic table location
Periodic table location

Images

Images
Images

Basic elemental properties

| cesium | barium atomic symbol | Cs | Ba atomic number | 55 | 56 short electronic configuration | [Xe]6s^1 | [Xe]6s^2 Aufbau diagram | 6s | 6s block | s | s group | 1 | 2 period | 6 | 6 atomic mass | 132.90545196 u | 137.327 u half-life | (stable) | (stable)
| cesium | barium atomic symbol | Cs | Ba atomic number | 55 | 56 short electronic configuration | [Xe]6s^1 | [Xe]6s^2 Aufbau diagram | 6s | 6s block | s | s group | 1 | 2 period | 6 | 6 atomic mass | 132.90545196 u | 137.327 u half-life | (stable) | (stable)

Thermodynamic properties

| cesium | barium phase at STP | solid | solid melting point | 28.44 °C | 727 °C boiling point | 671 °C | 1870 °C critical temperature | 1938 K | (unknown) critical pressure | 9.4 MPa | (unknown) molar heat of fusion | 2.09 kJ/mol | 8 kJ/mol molar heat of vaporization | 65 kJ/mol | 140 kJ/mol specific heat at STP | 242 J/(kg K) | 205 J/(kg K) (properties at standard conditions)
| cesium | barium phase at STP | solid | solid melting point | 28.44 °C | 727 °C boiling point | 671 °C | 1870 °C critical temperature | 1938 K | (unknown) critical pressure | 9.4 MPa | (unknown) molar heat of fusion | 2.09 kJ/mol | 8 kJ/mol molar heat of vaporization | 65 kJ/mol | 140 kJ/mol specific heat at STP | 242 J/(kg K) | 205 J/(kg K) (properties at standard conditions)

Material properties

| cesium | barium density | 1.879 g/cm^3 | 3.51 g/cm^3 liquid density | 1.843 g/cm^3 | 3.338 g/cm^3 molar volume | 70.73 cm^3/mol | 39.12 cm^3/mol Mohs hardness | 0.2 (between talc and gypsum) | 1.25 (between talc and gypsum) Brinell hardness | 0.14 MPa | bulk modulus | 1.6 GPa | 9.6 GPa shear modulus | | 4.9 GPa Young's modulus | 1.7 GPa | 13 GPa sound speed | | 1620 m/s thermal expansion | | 2.06×10^-5 K^(-1) thermal conductivity | 36 W/(m K) | 18 W/(m K) (properties at standard conditions)
| cesium | barium density | 1.879 g/cm^3 | 3.51 g/cm^3 liquid density | 1.843 g/cm^3 | 3.338 g/cm^3 molar volume | 70.73 cm^3/mol | 39.12 cm^3/mol Mohs hardness | 0.2 (between talc and gypsum) | 1.25 (between talc and gypsum) Brinell hardness | 0.14 MPa | bulk modulus | 1.6 GPa | 9.6 GPa shear modulus | | 4.9 GPa Young's modulus | 1.7 GPa | 13 GPa sound speed | | 1620 m/s thermal expansion | | 2.06×10^-5 K^(-1) thermal conductivity | 36 W/(m K) | 18 W/(m K) (properties at standard conditions)

Electromagnetic properties

| cesium | barium electrical type | conductor | conductor resistivity | 2×10^-7 Ω m (ohm meters) | 3.5×10^-7 Ω m (ohm meters) electrical conductivity | 5×10^6 S/m (siemens per meter) | 2.9×10^6 S/m (siemens per meter) magnetic type | paramagnetic | paramagnetic volume magnetic susceptibility | 5.26×10^-6 | 3.966×10^-5 mass magnetic susceptibility | 2.8×10^-9 m^3/kg (cubic meters per kilogram) | 1.13×10^-8 m^3/kg (cubic meters per kilogram) molar magnetic susceptibility | 3.72×10^-10 m^3/mol (cubic meters per mole) | 1.552×10^-9 m^3/mol (cubic meters per mole) work function | 1.95 eV (Polycrystalline) | 2.52 eV (Polycrystalline) threshold frequency | 4.715×10^14 Hz (hertz) | 6.093×10^14 Hz (hertz) color | (yellow) | (silver)
| cesium | barium electrical type | conductor | conductor resistivity | 2×10^-7 Ω m (ohm meters) | 3.5×10^-7 Ω m (ohm meters) electrical conductivity | 5×10^6 S/m (siemens per meter) | 2.9×10^6 S/m (siemens per meter) magnetic type | paramagnetic | paramagnetic volume magnetic susceptibility | 5.26×10^-6 | 3.966×10^-5 mass magnetic susceptibility | 2.8×10^-9 m^3/kg (cubic meters per kilogram) | 1.13×10^-8 m^3/kg (cubic meters per kilogram) molar magnetic susceptibility | 3.72×10^-10 m^3/mol (cubic meters per mole) | 1.552×10^-9 m^3/mol (cubic meters per mole) work function | 1.95 eV (Polycrystalline) | 2.52 eV (Polycrystalline) threshold frequency | 4.715×10^14 Hz (hertz) | 6.093×10^14 Hz (hertz) color | (yellow) | (silver)

Reactivity

| cesium | barium valence | 1 | 2 electronegativity | 0.79 | 0.89 electron affinity | 45.5 kJ/mol (kilojoules per mole) | 13.95 kJ/mol (kilojoules per mole) first ionization energy | 375.7 kJ/mol (kilojoules per mole) | 502.9 kJ/mol (kilojoules per mole) ionization energies | 375.7 kJ/mol | 2234.3 kJ/mol | 3400 kJ/mol | 502.9 kJ/mol | 965.2 kJ/mol | 3600 kJ/mol
| cesium | barium valence | 1 | 2 electronegativity | 0.79 | 0.89 electron affinity | 45.5 kJ/mol (kilojoules per mole) | 13.95 kJ/mol (kilojoules per mole) first ionization energy | 375.7 kJ/mol (kilojoules per mole) | 502.9 kJ/mol (kilojoules per mole) ionization energies | 375.7 kJ/mol | 2234.3 kJ/mol | 3400 kJ/mol | 502.9 kJ/mol | 965.2 kJ/mol | 3600 kJ/mol
Reactivity
Reactivity

Atomic properties

| cesium | barium term symbol | ^2S_(1/2) | ^1S_0 atomic radius | 260 pm | 215 pm covalent radius | 244 pm | 215 pm (electronic ground state properties)
| cesium | barium term symbol | ^2S_(1/2) | ^1S_0 atomic radius | 260 pm | 215 pm covalent radius | 244 pm | 215 pm (electronic ground state properties)

Abundances

| cesium | barium universe abundance | 8×10^-8 mass% | 1×10^-6 mass% solar abundance | 8×10^-7 mass% | 1×10^-6 mass% meteorite abundance | 1.4×10^-5 mass% | 2.7×10^-4 mass% crust abundance | 1.9×10^-4 mass% | 0.034 mass% ocean abundance | 5×10^-8 mass% | 3×10^-6 mass% human abundance | 2×10^-6 mass% | 3×10^-5 mass% universe molar abundance | 1×10^-9 mol% | 9×10^-9 mol% solar molar abundance | 7×10^-9 mol% | 9.9×10^-9 mol% meteorite molar abundance | 2×10^-6 mol% | 4.1×10^-5 mol% ocean molar abundance | 2.3×10^-9 mol% | 1.4×10^-7 mol% crust molar abundance | 2.9×10^-5 mol% | 0.0051 mol% human molar abundance | 1×10^-7 mol% | 1.4×10^-6 mol%
| cesium | barium universe abundance | 8×10^-8 mass% | 1×10^-6 mass% solar abundance | 8×10^-7 mass% | 1×10^-6 mass% meteorite abundance | 1.4×10^-5 mass% | 2.7×10^-4 mass% crust abundance | 1.9×10^-4 mass% | 0.034 mass% ocean abundance | 5×10^-8 mass% | 3×10^-6 mass% human abundance | 2×10^-6 mass% | 3×10^-5 mass% universe molar abundance | 1×10^-9 mol% | 9×10^-9 mol% solar molar abundance | 7×10^-9 mol% | 9.9×10^-9 mol% meteorite molar abundance | 2×10^-6 mol% | 4.1×10^-5 mol% ocean molar abundance | 2.3×10^-9 mol% | 1.4×10^-7 mol% crust molar abundance | 2.9×10^-5 mol% | 0.0051 mol% human molar abundance | 1×10^-7 mol% | 1.4×10^-6 mol%

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