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8 nitrogenoxygenfluorine


Lagyu, Symbulu, Numeru oxygen, O, 8
Chemical seriesnonmetals, chalcogens
Lupung, Period, Bloki 162, p
Liquid Oxygen
Standard atomic weight 15.9994(3) g·mol−1
Electron configuration 1s2 2s2 2p4
Electrons per shell 2, 6
Physical properties
Melting point54.36 K
(-218.79 °C, -361.82 °F)
Boiling point90.20 K
(-182.95 °C, -297.31 °F)
Critical point154.59 K, 5.043 MPa
Heat of fusion(O2) 0.444 kJ·mol−1
Heat of vaporization(O2) 6.82 kJ·mol−1
Heat capacity(25 °C) (O2)
29.378 J·mol−1·K−1
Vapor pressure
P/Pa 1 10 100 1 k 10 k 100 k
at T/K       61 73 90
Atomic properties
Crystal structurecubic
Oxidation states2, 1, −1, −2
(neutral oxide)
Electronegativity3.44 (Pauling scale)
Ionization energies
1st: 1313.9 kJ·mol−1
2nd: 3388.3 kJ·mol−1
3rd: 5300.5 kJ·mol−1
Atomic radius60 pm
Atomic radius (calc.)48 pm
Covalent radius73 pm
Van der Waals radius152 pm
Magnetic orderingparamagnetic
Thermal conductivity(300 K) 26.58x10-3  W·m−1·K−1
Speed of sound(gas, 27 °C) 330 m/s
CAS registry number7782-44-7
Selected isotopes
Main article: Isotopes of oxygen
iso NA half-life DM DE (MeV) DP
16O 99.76% Ing O stable ya kambe ning 8 neutrons
17O 0.039% Ing O stable ya kambe ning 9 neutrons
18O 0.201% Ing O stable ya kambe ning 10 neutrons
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