Atomic Oxygen:

Physical Properties:

 
Melting Point: 54.8 K.
Boiling Point: 90.188 K.
Critical Temperature: 154.6 K.
Critical Pressure: 5050 kPa.
Critical Volume: 73.4 cm3 mol-1.
Heat of Fusion:  0.444 kJ mol-1.
Heat of Vaporistaion: 6.82 kJ mol-1.
Thermal Properties (298.15K, 0.1MPa)
StatedelHdelGdelSdelCp
Gas Molecular00205.13829.355
Gas Atomic249.17231.17168.05521.912
Density Kgm-3
SolidLiquidGas
200011401.429
Thermal conductivity:  0.2674 W.m-1.K-1 {300K}
Molar vloume:  8.00 cm3 {54K}
Ground State Electronic Configuration:
1s 2s2 2p2x p1y p1z
Spectroscopic Term Symbol (atomic): 2s+1 Lj = 3P2
Electron Affinity: 141 kJ.mol-1.
Main Lines in Atomic Spectra: 
Wavelength	Species
(nm)
777.194		1
777.417		1
844.625		1
844.636		1
844.676		1

Homonuclear Diatomic Oxygen (Molecular Oxygen):

Amounts to 1.2 x 1015 tonnes in the atmosphere at a concentration of 209 500 p.p.m. or 20.95 % by volume.

Magnetic susceptibility (mass): +133.6 x 10-8 Kg-1. {20 C}.

Bonding: In molecular oxygen two outer electrons are shared in a double covalent bond: 


       \	  /	The bond lengths are
         \      /	1.208 Angstroms.
          O = O		The bond strength being
         /      \	498.34 +/- 0.2 kJ.mol-1
       /          \

Spectroscopic Terms: 

                       3  __ -      Wavelength		Energy   
Ground State:            \              0.0 nm		  0.0 eV
(Triplet)                /__ g

			1 
First Excited State:     /\	     1268.7 nm	       0.9772 eV
(Singlet)	        /__\ g      


		       1  __ +
Second Excited State:    \	      762.1 nm		1.627 eV
(Singlet)       	 /__ g

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