oxygen

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 conductivity: 0.2674 W.m^-1.K^-1 {300K}

Molar volume: 8.00 cm³ {54K}

Ground State Electronic Configuration:

1s 2s² 2p²_x p¹_y p¹_z

Spectroscopic Term Symbol (atomic): ^2s+1 L_j = 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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