oxygen

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Symbol:

O

Atomic Number:

8

Relative Atomic Mass:

15.9994 g mol^-1

Natural Abundance in Lithosphere, hydrosphere and atmosphere:

49.4% (mass fraction)

Electron Configuration:

[He]2s²2p⁴

Oxidation States:

-II, -I

Atomic Radius:

60.4pm

Covalent Radius:

66pm

Ionic Radius:

138pm (for -2 oxidation state)

Van der Waals Radius:

140pm

Boiling Point:

-183.0°C

Density:

1.33 g L^-1 (at 1013 mbar)

First Ionisation Energy:

13.618 eV

Electronegativity (Allred and Rochow):

3.5

Number of Natural Isotopes:

3

Mass Number of the Most Abundant Isotopes:

209 g mol^-1 a 99.76% abundance

209 g mol^-1 a 0.04% abundance

209 g mol^-1 a 0.20% abundance