Input interpretation
rubidium (chemical element)
Periodic table location
Periodic table location
Image
Image
Basic elemental properties
![atomic symbol | Rb atomic number | 37 short electronic configuration | [Kr]5s^1 Aufbau diagram | 5s block | s group | 1 period | 5 atomic mass | 85.4678 u (unified atomic mass units)](../image_source/9367df11d1634be312ef47110368eca1.png)
atomic symbol | Rb atomic number | 37 short electronic configuration | [Kr]5s^1 Aufbau diagram | 5s block | s group | 1 period | 5 atomic mass | 85.4678 u (unified atomic mass units)
Thermodynamic properties
phase at STP | solid melting point | 39.31 °C (rank: 87th) boiling point | 688 °C (rank: 75th) critical temperature | 2093 K (rank: 4th) critical pressure | 16 MPa (rank: 6th) molar heat of fusion | 2.19 kJ/mol (rank: 81st) molar heat of vaporization | 72 kJ/mol (rank: 71st) specific heat at STP | 364 J/(kg K) (rank: 34th) (properties at standard conditions)
Material properties
density | 1.532 g/cm^3 (rank: 82nd) liquid density | 1.46 g/cm^3 molar volume | 55.79 cm^3/mol Mohs hardness | 0.3 (between talc and gypsum) Brinell hardness | 0.216 MPa (rank: 59th) bulk modulus | 2.5 GPa (rank: 66th) Young's modulus | 2.4 GPa (rank: 62nd) sound speed | 1300 m/s (rank: 60th) thermal conductivity | 58 W/(m K) (rank: 30th) (properties at standard conditions)
Electromagnetic properties
electrical type | conductor resistivity | 1.2×10^-7 Ω m (ohm meters) electrical conductivity | 8.3×10^6 S/m (siemens per meter) magnetic type | paramagnetic volume magnetic susceptibility | 3.98×10^-6 mass magnetic susceptibility | 2.6×10^-9 m^3/kg (cubic meters per kilogram) molar magnetic susceptibility | 2.22×10^-10 m^3/mol (cubic meters per mole) work function | 2.26 eV (Polycrystalline) threshold frequency | 5.467×10^14 Hz (hertz) color | (silver)
Reactivity
valence | 1 electronegativity | 0.82 electron affinity | 46.9 kJ/mol (kilojoules per mole) first ionization energy | 403 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
Reactivity
Atomic properties
term symbol | ^2S_(1/2) atomic radius | 235 pm covalent radius | 220 pm (electronic ground state properties)
(neutral rubidium atomic spectrum)
Abundances
universe abundance | 1×10^-6 mass% (rank: 33rd) solar abundance | 3×10^-6 mass% (rank: 32nd) meteorite abundance | 3.2×10^-4 mass% (rank: 30th) crust abundance | 0.006 mass% (rank: 25th) ocean abundance | 1.2×10^-5 mass% (rank: 18th) human abundance | 4.6×10^-4 mass% (rank: 16th) universe molar abundance | 1×10^-8 mol% (rank: 35th) solar molar abundance | 4×10^-8 mol% (rank: 32nd) meteorite molar abundance | 7.8×10^-5 mol% (rank: 32nd) ocean molar abundance | 8.7×10^-7 mol% (rank: 30th) crust molar abundance | 0.0014 mol% (rank: 28th) human molar abundance | 3.4×10^-5 mol% (rank: 17th)