Oxygen

Chemical, physical and material properties and data of the chemical element Oxygen.

Contents

General Information about Oxygen

Regular nameOxygenChemical symbolOOther namesHistorical namesName meaning, originDiscovery (year)OccurencePosition in the PSEGroup membership

Atomar Properties of Oxygen

Atomic number Z8 = number of protonsStandard Atomic Weight15.999
intervall: [15.99903, 15.99977]

Electron configuration of Oxygen

1s	2s	2p	3s	3p	3d	4s	4p	4d	4f	5s	5p	5d	5f	6s	6p	6d	6f	7s	7p
2	2	4

Shorthand electron configuration of Oxygen: [He] 2s² 2p⁴ .

Ionization Energies of Oxygen

The following table lists the ionization energies IE (ionization potentials); the IE is the energy required in electron volt (eV) per atom to separate a given electron from an Oxygen atom.

IE1	IE2	IE3	IE4	IE5	IE6	IE7	IE8
13.61805	35.1211	54.9355	77.41353	113.8990	138.1197	739.29	871.4101

Isotopic Data of Oxygen

An overview of the nuclides as well as the isotopic data and properties are listed on the following page: Oxygen isotopes.

Chemistry of Oxygen

Electronegativity3.5 (Pauling original)
3.44 (Pauling)
3.610 (Allen)
3.0 (Mulliken)
3.46 (Sanderson)
3.50 (Allred-Rochow)
8.7861 eV (Gosh Gupta)
7.54 eV (Pearson)Electron affinity1.461 113 6(9) eV
140.976 0(2) kJ mol^-1

Standard Electrode Potential

E⁰ (V)	Symbol	N_ox	Name Ox. Name Red.	Ox. Red.	e^-
-0.13	O	0 - I	Oxygen Hydroperoxy radical	O₂ (g) + H⁺ ⇄ HO₂• (aq)	+ e^-
0.401	O	0 - II	Oxygen Hydroxy anion	O₂ (g) + 2 H₂O ⇄ 4 OH^-	+ 4 e^-
1.229	O	0 - II	Oxygen Water	2 O₂ (g) + 4 H⁺ ⇄ 2 H₂O	+ 4 e^-
1.51	O	- 0,5 - I	Hydroperoxy radical Hydrogen peroxide	HO₂• + H⁺ ⇄ H₂O₂	+ e^-
1.763	O	- I - II	Hydrogen peroxide Water	H₂O₂ (aq) + 2 H⁺ ⇄ 2 H₂O	+ 2 e^-
2.01	O	- I - II	Peroxodisulfate Sulfate	S₂O₈^2- ⇄ 2 SO₄^2-	+ 2 e^-
2.075	O	0 - II	Ozone Water	O₃ + 2 H⁺ ⇄ O₂ + H₂O	+ 2 e^-

Material and Physical Properties

Melting point- 218.79 °CEnthalpy of fusion (molar)0.444 kJ mol^-1Boiling point- 182.962 °CEnthalpy of vaporization6.82 kJ mol^-1Density1.429 g L ^-1 (0°C; 101.325 kPa. O₂)

External Data, Identifiers

CAS registry number7782-44-7InChI =1S/OInChIKeyQVGXLLKOCUKJST-UHFFFAOYSA-NPubChem ID977

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Last update: 2022-12-12

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