Input interpretation
hydrogen (chemical element) | francium (chemical element) | cesium (chemical element)
Periodic table location
Periodic table location
Images
Images
Basic elemental properties
![| hydrogen | francium | cesium atomic symbol | H | Fr | Cs atomic number | 1 | 87 | 55 short electronic configuration | 1s^1 | [Rn]7s^1 | [Xe]6s^1 Aufbau diagram | 1s | 7s | 6s block | s | s | s group | 1 | 1 | 1 period | 1 | 7 | 6 atomic mass | 1.008 u | 223 u | 132.90545196 u half-life | (stable) | 22 min | (stable)](../image_source/401a95e1eb24f68c1c4108b9bf470b30.png)
| hydrogen | francium | cesium atomic symbol | H | Fr | Cs atomic number | 1 | 87 | 55 short electronic configuration | 1s^1 | [Rn]7s^1 | [Xe]6s^1 Aufbau diagram | 1s | 7s | 6s block | s | s | s group | 1 | 1 | 1 period | 1 | 7 | 6 atomic mass | 1.008 u | 223 u | 132.90545196 u half-life | (stable) | 22 min | (stable)
Thermodynamic properties
| hydrogen | francium | cesium phase at STP | gas | solid | solid melting point | -259.14 °C | | 28.44 °C boiling point | -252.87 °C | | 671 °C critical temperature | 32.97 K | | 1938 K critical pressure | 1.293 MPa | | 9.4 MPa molar heat of fusion | 0.558 kJ/mol | 2 kJ/mol | 2.09 kJ/mol molar heat of vaporization | 0.452 kJ/mol | 65 kJ/mol | 65 kJ/mol specific heat at STP | 14300 J/(kg K) | | 242 J/(kg K) adiabatic index | 7/5 | | (properties at standard conditions)
Material properties
| hydrogen | cesium density | 8.99×10^-5 g/cm^3 | 1.879 g/cm^3 liquid density | | 1.843 g/cm^3 molar volume | 11200 cm^3/mol | 70.73 cm^3/mol Mohs hardness | | 0.2 (between talc and gypsum) Brinell hardness | | 0.14 MPa bulk modulus | | 1.6 GPa Young's modulus | | 1.7 GPa refractive index | 1.000132 | sound speed | 1270 m/s | thermal conductivity | 0.1805 W/(m K) | 36 W/(m K) (properties at standard conditions)
Electromagnetic properties
| hydrogen | francium | cesium electrical type | | | conductor resistivity | | | 2×10^-7 Ω m (ohm meters) electrical conductivity | | | 5×10^6 S/m (siemens per meter) magnetic type | diamagnetic | | paramagnetic volume magnetic susceptibility | -2.23×10^-9 | | 5.26×10^-6 mass magnetic susceptibility | -2.48×10^-8 m^3/kg (cubic meters per kilogram) | | 2.8×10^-9 m^3/kg (cubic meters per kilogram) molar magnetic susceptibility | -4.999×10^-11 m^3/mol (cubic meters per mole) | | 3.72×10^-10 m^3/mol (cubic meters per mole) work function | | | 1.95 eV (Polycrystalline) threshold frequency | | | 4.715×10^14 Hz (hertz) color | (colorless) | (silver) | (yellow) refractive index | 1.000132 | |
Reactivity
| hydrogen | francium | cesium valence | 1 | 1 | 1 electronegativity | 2.2 | 0.7 | 0.79 electron affinity | 72.8 kJ/mol (kilojoules per mole) | | 45.5 kJ/mol (kilojoules per mole) first ionization energy | 1312 kJ/mol (kilojoules per mole) | 380 kJ/mol (kilojoules per mole) | 375.7 kJ/mol (kilojoules per mole) ionization energies | 1312 kJ/mol | 380 kJ/mol | 375.7 kJ/mol | 2234.3 kJ/mol | 3400 kJ/mol
Reactivity
Atomic properties
| hydrogen | francium | cesium term symbol | ^2S_(1/2) | ^2S_(1/2) | ^2S_(1/2) atomic radius | 25 pm | | 260 pm covalent radius | 31 pm | 260 pm | 244 pm van der Waals radius | 120 pm | | (electronic ground state properties)
Abundances
| hydrogen | francium | cesium universe abundance | 75 mass% | | 8×10^-8 mass% solar abundance | 75 mass% | | 8×10^-7 mass% meteorite abundance | 2.4 mass% | | 1.4×10^-5 mass% crust abundance | 0.15 mass% | | 1.9×10^-4 mass% ocean abundance | 11 mass% | | 5×10^-8 mass% human abundance | 10 mass% | 0 mass% | 2×10^-6 mass% universe molar abundance | 93 mol% | | 1×10^-9 mol% solar molar abundance | 93 mol% | | 7×10^-9 mol% meteorite molar abundance | 17 mol% | | 2×10^-6 mol% ocean molar abundance | 66 mol% | | 2.3×10^-9 mol% crust molar abundance | 3.1 mol% | | 2.9×10^-5 mol% human molar abundance | 62 mol% | 0 mol% | 1×10^-7 mol%