Input interpretation
oxygen (chemical element)
Periodic table location
Periodic table location
Image
Image
Basic elemental properties
![atomic symbol | O atomic number | 8 short electronic configuration | [He]2s^22p^4 Aufbau diagram | 2p 2s block | p group | 16 period | 2 atomic mass | 15.999 u (unified atomic mass units)](../image_source/166b6152f0655637dd9cb75287602270.png)
atomic symbol | O atomic number | 8 short electronic configuration | [He]2s^22p^4 Aufbau diagram | 2p 2s block | p group | 16 period | 2 atomic mass | 15.999 u (unified atomic mass units)
Thermodynamic properties
phase at STP | gas melting point | -218.3 °C (rank: 98th) boiling point | -182.9 °C (rank: 88th) critical temperature | 154.59 K (rank: 15th) critical pressure | 5.043 MPa (rank: 16th) molar heat of fusion | 0.222 kJ/mol (rank: 92nd) molar heat of vaporization | 3.41 kJ/mol (rank: 89th) specific heat at STP | 919 J/(kg K) (rank: 11th) adiabatic index | 7/5 (rank: 1st) (properties at standard conditions)
Material properties
density | 0.001429 g/cm^3 (rank: 92nd) molar volume | 11200 cm^3/mol refractive index | 1.000271 sound speed | 317.5 m/s (rank: 71st) thermal conductivity | 0.02658 W/(m K) (rank: 88th) (properties at standard conditions)
Electromagnetic properties
magnetic type | paramagnetic volume magnetic susceptibility | 1.90772×10^-6 mass magnetic susceptibility | 1.335×10^-6 m^3/kg (cubic meters per kilogram) molar magnetic susceptibility | 4.27184×10^-8 m^3/mol (cubic meters per mole) color | (colorless) refractive index | 1.000271
Reactivity
valence | 2 electronegativity | 3.44 electron affinity | 141 kJ/mol (kilojoules per mole) first ionization energy | 1313.9 kJ/mol (kilojoules per mole) ionization energies | 1313.9 kJ/mol | 3388.3 kJ/mol | 5300.5 kJ/mol | 7469.2 kJ/mol | 10989.5 kJ/mol | 13326.5 kJ/mol | 71330 kJ/mol | 84078 kJ/mol
Reactivity
Atomic properties
term symbol | ^3P_2 atomic radius | 60 pm covalent radius | 66 pm van der Waals radius | 152 pm (electronic ground state properties)
(neutral oxygen atomic spectrum)
Abundances
universe abundance | 1 mass% (rank: 3rd) solar abundance | 0.9 mass% (rank: 3rd) meteorite abundance | 40 mass% (rank: 1st) crust abundance | 46 mass% (rank: 1st) ocean abundance | 86 mass% (rank: 1st) human abundance | 61 mass% (rank: 1st) universe molar abundance | 0.08 mol% (rank: 3rd) solar molar abundance | 0.07 mol% (rank: 3rd) meteorite molar abundance | 48 mol% (rank: 1st) ocean molar abundance | 33 mol% (rank: 2nd) crust molar abundance | 60 mol% (rank: 1st) human molar abundance | 24 mol% (rank: 2nd)
Nuclear properties
half-life | (stable) stable isotopes | O-16 (99.762%) | O-18 (0.2%) | O-17 (3.8×10^-4) nuclear spin | O-12: 0^+ | O-13: 3/2^- | O-14: 0^+ | O-15: 1/2^- | O-16: 0^+ | O-17: 5/2^+ | O-18: 0^+ | O-19: 5/2^+ | O-20: 0^+ | O-21: 5/2^+ | O-22: 0^+ | O-23: 1/2^+ | O-24: 0^+ | O-25: 3/2^+ | O-26: 0^+ | O-27: 3/2^+ | O-28: 0^+ unstable isotopes | O-15 (122.24 s) | O-14 (70.606 s) | O-19 (26.88 s) | O-20 (13.51 s) | O-21 (3.42 s) | O-22 (2.25 s) | O-23 (82 ms) | O-24 (65 ms) | O-13 (8.58 ms) | O-27 (260 ns) | O-28 (100 ns) | O-25 (50 ns) | O-26 (40 ns) | O-12 (1.14 zs) neutron cross-section | 2.8×10^-4 b neutron mass absorption | 1×10^-6 m^2/kg
Identifiers
CAS number | 7782-44-7 PubChem CID number | 977