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strontium, cesium

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strontium (chemical element) | cesium (chemical element)
strontium (chemical element) | cesium (chemical element)

Periodic table location

Periodic table location
Periodic table location

Images

Images
Images

Basic elemental properties

| strontium | cesium atomic symbol | Sr | Cs atomic number | 38 | 55 short electronic configuration | [Kr]5s^2 | [Xe]6s^1 Aufbau diagram | 5s | 6s block | s | s group | 2 | 1 period | 5 | 6 atomic mass | 87.62 u | 132.90545196 u half-life | (stable) | (stable)
| strontium | cesium atomic symbol | Sr | Cs atomic number | 38 | 55 short electronic configuration | [Kr]5s^2 | [Xe]6s^1 Aufbau diagram | 5s | 6s block | s | s group | 2 | 1 period | 5 | 6 atomic mass | 87.62 u | 132.90545196 u half-life | (stable) | (stable)

Thermodynamic properties

| strontium | cesium phase at STP | solid | solid melting point | 777 °C | 28.44 °C boiling point | 1382 °C | 671 °C critical temperature | | 1938 K critical pressure | | 9.4 MPa molar heat of fusion | 8 kJ/mol | 2.09 kJ/mol molar heat of vaporization | 137 kJ/mol | 65 kJ/mol specific heat at STP | 300 J/(kg K) | 242 J/(kg K) (properties at standard conditions)
| strontium | cesium phase at STP | solid | solid melting point | 777 °C | 28.44 °C boiling point | 1382 °C | 671 °C critical temperature | | 1938 K critical pressure | | 9.4 MPa molar heat of fusion | 8 kJ/mol | 2.09 kJ/mol molar heat of vaporization | 137 kJ/mol | 65 kJ/mol specific heat at STP | 300 J/(kg K) | 242 J/(kg K) (properties at standard conditions)

Material properties

| strontium | cesium density | 2.63 g/cm^3 | 1.879 g/cm^3 liquid density | 2.375 g/cm^3 | 1.843 g/cm^3 molar volume | 33.32 cm^3/mol | 70.73 cm^3/mol Mohs hardness | 1.5 (between talc and gypsum) | 0.2 (between talc and gypsum) Brinell hardness | | 0.14 MPa bulk modulus | | 1.6 GPa shear modulus | 6.1 GPa | Young's modulus | | 1.7 GPa Poisson ratio | 0.28 | thermal expansion | 2.25×10^-5 K^(-1) | thermal conductivity | 35 W/(m K) | 36 W/(m K) (properties at standard conditions)
| strontium | cesium density | 2.63 g/cm^3 | 1.879 g/cm^3 liquid density | 2.375 g/cm^3 | 1.843 g/cm^3 molar volume | 33.32 cm^3/mol | 70.73 cm^3/mol Mohs hardness | 1.5 (between talc and gypsum) | 0.2 (between talc and gypsum) Brinell hardness | | 0.14 MPa bulk modulus | | 1.6 GPa shear modulus | 6.1 GPa | Young's modulus | | 1.7 GPa Poisson ratio | 0.28 | thermal expansion | 2.25×10^-5 K^(-1) | thermal conductivity | 35 W/(m K) | 36 W/(m K) (properties at standard conditions)

Electromagnetic properties

| strontium | cesium electrical type | conductor | conductor resistivity | 1.3×10^-7 Ω m (ohm meters) | 2×10^-7 Ω m (ohm meters) electrical conductivity | 7.7×10^6 S/m (siemens per meter) | 5×10^6 S/m (siemens per meter) magnetic type | paramagnetic | paramagnetic volume magnetic susceptibility | 3.47×10^-6 | 5.26×10^-6 mass magnetic susceptibility | 1.32×10^-9 m^3/kg (cubic meters per kilogram) | 2.8×10^-9 m^3/kg (cubic meters per kilogram) molar magnetic susceptibility | 1.16×10^-10 m^3/mol (cubic meters per mole) | 3.72×10^-10 m^3/mol (cubic meters per mole) work function | 2.59 eV (Polycrystalline) | 1.95 eV (Polycrystalline) threshold frequency | 6.263×10^14 Hz (hertz) | 4.715×10^14 Hz (hertz) color | (silver) | (yellow)
| strontium | cesium electrical type | conductor | conductor resistivity | 1.3×10^-7 Ω m (ohm meters) | 2×10^-7 Ω m (ohm meters) electrical conductivity | 7.7×10^6 S/m (siemens per meter) | 5×10^6 S/m (siemens per meter) magnetic type | paramagnetic | paramagnetic volume magnetic susceptibility | 3.47×10^-6 | 5.26×10^-6 mass magnetic susceptibility | 1.32×10^-9 m^3/kg (cubic meters per kilogram) | 2.8×10^-9 m^3/kg (cubic meters per kilogram) molar magnetic susceptibility | 1.16×10^-10 m^3/mol (cubic meters per mole) | 3.72×10^-10 m^3/mol (cubic meters per mole) work function | 2.59 eV (Polycrystalline) | 1.95 eV (Polycrystalline) threshold frequency | 6.263×10^14 Hz (hertz) | 4.715×10^14 Hz (hertz) color | (silver) | (yellow)

Reactivity

| strontium | cesium valence | 2 | 1 electronegativity | 0.95 | 0.79 electron affinity | 5.03 kJ/mol (kilojoules per mole) | 45.5 kJ/mol (kilojoules per mole) first ionization energy | 549.5 kJ/mol (kilojoules per mole) | 375.7 kJ/mol (kilojoules per mole) ionization energies | 549.5 kJ/mol | 1064.2 kJ/mol | 4138 kJ/mol | 5500 kJ/mol | 6910 kJ/mol | 8760 kJ/mol | 10230 kJ/mol | 11800 kJ/mol | 15600 kJ/mol | 17100 kJ/mol | 375.7 kJ/mol | 2234.3 kJ/mol | 3400 kJ/mol
| strontium | cesium valence | 2 | 1 electronegativity | 0.95 | 0.79 electron affinity | 5.03 kJ/mol (kilojoules per mole) | 45.5 kJ/mol (kilojoules per mole) first ionization energy | 549.5 kJ/mol (kilojoules per mole) | 375.7 kJ/mol (kilojoules per mole) ionization energies | 549.5 kJ/mol | 1064.2 kJ/mol | 4138 kJ/mol | 5500 kJ/mol | 6910 kJ/mol | 8760 kJ/mol | 10230 kJ/mol | 11800 kJ/mol | 15600 kJ/mol | 17100 kJ/mol | 375.7 kJ/mol | 2234.3 kJ/mol | 3400 kJ/mol
Reactivity
Reactivity

Atomic properties

| strontium | cesium term symbol | ^1S_0 | ^2S_(1/2) atomic radius | 200 pm | 260 pm covalent radius | 195 pm | 244 pm (electronic ground state properties)
| strontium | cesium term symbol | ^1S_0 | ^2S_(1/2) atomic radius | 200 pm | 260 pm covalent radius | 195 pm | 244 pm (electronic ground state properties)

Abundances

| strontium | cesium universe abundance | 4×10^-6 mass% | 8×10^-8 mass% solar abundance | 5×10^-6 mass% | 8×10^-7 mass% meteorite abundance | 8.7×10^-4 mass% | 1.4×10^-5 mass% crust abundance | 0.036 mass% | 1.9×10^-4 mass% ocean abundance | 8.1×10^-4 mass% | 5×10^-8 mass% human abundance | 4.6×10^-4 mass% | 2×10^-6 mass% universe molar abundance | 6×10^-8 mol% | 1×10^-9 mol% solar molar abundance | 7×10^-8 mol% | 7×10^-9 mol% meteorite molar abundance | 2×10^-4 mol% | 2×10^-6 mol% ocean molar abundance | 5.7×10^-5 mol% | 2.3×10^-9 mol% crust molar abundance | 0.0085 mol% | 2.9×10^-5 mol% human molar abundance | 3.3×10^-5 mol% | 1×10^-7 mol%
| strontium | cesium universe abundance | 4×10^-6 mass% | 8×10^-8 mass% solar abundance | 5×10^-6 mass% | 8×10^-7 mass% meteorite abundance | 8.7×10^-4 mass% | 1.4×10^-5 mass% crust abundance | 0.036 mass% | 1.9×10^-4 mass% ocean abundance | 8.1×10^-4 mass% | 5×10^-8 mass% human abundance | 4.6×10^-4 mass% | 2×10^-6 mass% universe molar abundance | 6×10^-8 mol% | 1×10^-9 mol% solar molar abundance | 7×10^-8 mol% | 7×10^-9 mol% meteorite molar abundance | 2×10^-4 mol% | 2×10^-6 mol% ocean molar abundance | 5.7×10^-5 mol% | 2.3×10^-9 mol% crust molar abundance | 0.0085 mol% | 2.9×10^-5 mol% human molar abundance | 3.3×10^-5 mol% | 1×10^-7 mol%

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