hydrogen vs rubidium vs cesium vs lithium

hydrogen (chemical element) | rubidium (chemical element) | cesium (chemical element) | lithium (chemical element)

Periodic table location

Images

| atomic symbol | atomic number | short electronic configuration hydrogen | H | 1 | 1s^1 rubidium | Rb | 37 | [Kr]5s^1 cesium | Cs | 55 | [Xe]6s^1 lithium | Li | 3 | [He]2s^1 | Aufbau diagram | block | group hydrogen | 1s | s | 1 rubidium | 5s | s | 1 cesium | 6s | s | 1 lithium | 2s | s | 1 | period | atomic mass | half-life hydrogen | 1 | 1.008 u | (stable) rubidium | 5 | 85.4678 u | (stable) cesium | 6 | 132.90545196 u | (stable) lithium | 2 | 6.94 u | (stable)

phase at STP | all | gas | solid melting point | median | 33.88 °C | highest | 180.54 °C (lithium) | lowest | -259.14 °C (hydrogen) | distribution | boiling point | median | 679 °C | highest | 1342 °C (lithium) | lowest | -252.87 °C (hydrogen) | distribution | critical temperature | median | 2015 K | highest | 3223 K (lithium) | lowest | 32.97 K (hydrogen) | distribution | critical pressure | median | 13 MPa | highest | 67 MPa (lithium) | lowest | 1.293 MPa (hydrogen) molar heat of fusion | median | 2.14 kJ/mol | highest | 3 kJ/mol (lithium) | lowest | 0.558 kJ/mol (hydrogen) | distribution | molar heat of vaporization | median | 69 kJ/mol | highest | 147 kJ/mol (lithium) | lowest | 0.452 kJ/mol (hydrogen) | distribution | specific heat at STP | median | 1967 J/(kg K) | highest | 14300 J/(kg K) (hydrogen) | lowest | 242 J/(kg K) (cesium) (properties at standard conditions)

density | median | 1.03 g/cm^3 | highest | 1.879 g/cm^3 (cesium) | lowest | 8.99×10^-5 g/cm^3 (hydrogen) | distribution | liquid density | median | 1.46 g/cm^3 | highest | 1.843 g/cm^3 (cesium) | lowest | 0.512 g/cm^3 (lithium) | distribution | molar volume | median | 63.26 cm^3/mol | highest | 11200 cm^3/mol (hydrogen) | lowest | 13 cm^3/mol (lithium) Mohs hardness | median | 0.3 | highest | 0.6 (between talc and gypsum) (lithium) | lowest | 0.2 (between talc and gypsum) (cesium) | distribution | Brinell hardness | all | 0.14 MPa | 0.216 MPa bulk modulus | median | 2.5 GPa | highest | 11 GPa (lithium) | lowest | 1.6 GPa (cesium) | distribution | Young's modulus | median | 2.4 GPa | highest | 4.9 GPa (lithium) | lowest | 1.7 GPa (cesium) | distribution | ultimate tensile strength | all | 15 MPa sound speed | median | 1300 m/s | highest | 6000 m/s (lithium) | lowest | 1270 m/s (hydrogen) thermal conductivity | median | 47 W/(m K) | highest | 85 W/(m K) (lithium) | lowest | 0.1805 W/(m K) (hydrogen) | distribution | (properties at standard conditions)

resistivity | median | 1.2×10^-7 Ω m (ohm meters) | highest | 2×10^-7 Ω m (ohm meters) (cesium) | lowest | 9.4×10^-8 Ω m (ohm meters) (lithium) | distribution | electrical conductivity | median | 8.3×10^6 S/m (siemens per meter) | highest | 1.1×10^7 S/m (siemens per meter) (lithium) | lowest | 5×10^6 S/m (siemens per meter) (cesium) | distribution | volume magnetic susceptibility | median | 4.62×10^-6 | highest | 1.37×10^-5 (lithium) | lowest | -2.23×10^-9 (hydrogen) | distribution | mass magnetic susceptibility | median | 2.7×10^-9 m^3/kg (cubic meters per kilogram) | highest | 2.56×10^-8 m^3/kg (cubic meters per kilogram) (lithium) | lowest | -2.48×10^-8 m^3/kg (cubic meters per kilogram) (hydrogen) | distribution | molar magnetic susceptibility | median | 2×10^-10 m^3/mol (cubic meters per mole) | highest | 3.72×10^-10 m^3/mol (cubic meters per mole) (cesium) | lowest | -4.999×10^-11 m^3/mol (cubic meters per mole) (hydrogen) | distribution | work function | all | 1.95 eV | 2.26 eV | 2.93 eV

valence | median | 1 | highest | 1 (4 elements) | lowest | 1 (4 elements) electronegativity | median | 0.9 | highest | 2.2 (hydrogen) | lowest | 0.82 (rubidium and cesium) electron affinity | median | 53.3 kJ/mol (kilojoules per mole) | highest | 72.8 kJ/mol (kilojoules per mole) (hydrogen) | lowest | 45.5 kJ/mol (kilojoules per mole) (cesium) | distribution | first ionization energy | median | 461.6 kJ/mol (kilojoules per mole) | highest | 1312 kJ/mol (kilojoules per mole) (hydrogen) | lowest | 375.7 kJ/mol (kilojoules per mole) (cesium) | distribution |

term symbol | all | ^2S_(1/2) atomic radius | median | 190 pm | highest | 260 pm (cesium) | lowest | 25 pm (hydrogen) | distribution | covalent radius | median | 174 pm | highest | 244 pm (cesium) | lowest | 31 pm (hydrogen) | distribution | (electronic ground state properties)

universe abundance | median | 8×10^-7 mass% | highest | 75 mass% (hydrogen) | lowest | 8×10^-8 mass% (cesium) solar abundance | median | 1.9×10^-6 mass% | highest | 75 mass% (hydrogen) | lowest | 6×10^-9 mass% (lithium) meteorite abundance | median | 2.4×10^-4 mass% | highest | 2.4 mass% (hydrogen) | lowest | 1.4×10^-5 mass% (cesium) crust abundance | median | 0.0039 mass% | highest | 0.15 mass% (hydrogen) | lowest | 1.9×10^-4 mass% (cesium) ocean abundance | median | 1.5×10^-5 mass% | highest | 11 mass% (hydrogen) | lowest | 5×10^-8 mass% (cesium) human abundance | median | 2.3×10^-4 mass% | highest | 10 mass% (hydrogen) | lowest | 2×10^-6 mass% (cesium) universe molar abundance | median | 5.5×10^-8 mol% | highest | 93 mol% (hydrogen) | lowest | 1×10^-9 mol% (cesium) solar molar abundance | median | 2.4×10^-8 mol% | highest | 93 mol% (hydrogen) | lowest | 9.9×10^-10 mol% (lithium) meteorite molar abundance | median | 2.7×10^-4 mol% | highest | 17 mol% (hydrogen) | lowest | 2×10^-6 mol% (cesium) ocean molar abundance | median | 8.4×10^-6 mol% | highest | 66 mol% (hydrogen) | lowest | 2.3×10^-9 mol% (cesium) crust molar abundance | median | 0.0032 mol% | highest | 3.1 mol% (hydrogen) | lowest | 2.9×10^-5 mol% (cesium) human molar abundance | median | 1.8×10^-5 mol% | highest | 62 mol% (hydrogen) | lowest | 1×10^-7 mol% (cesium)