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Compare Oxygen vs Fluorine

Comparing Oxygen (O) and Fluorine (F). Atomic numbers 8 and 9 with atomic masses 15.999 u and 18.998 u, classified as nonmetal and nonmetal. Below: a side-by-side comparison of their physical, atomic, electron-configuration and historical properties, including density, melting and boiling points, ionization energies, oxidation states and discovery history.

vs
O
Oxygen
#8
F
Fluorine
#9

Periodic properties of the elements

OxygenFluorine
SymbolOF
Atomic number89
Group1617
Period22
Blockpp
Element categoryNonmetalNonmetal

Physical properties

OxygenFluorine
Phase at STPGasGas
Density1.429 g/cm31.696 g/cm3
Atomic weight15.999 u18.9984 u
Melting point54.36 K
-218.79 °C
-361.822 °F		53.48 K
-219.67 °C
-363.406 °F
Boiling point90.188 K
-182.962 °C
-297.3316 °F		85.03 K
-188.12 °C
-306.616 °F

Atomic properties

OxygenFluorine
Electronegativity (Pauling Scale)3.443.98
Electron affinity140.976 kJ/mol328.165 kJ/mol
Oxidation states−2, −1, 0, +1, +2
()		−1, 0
(oxidizes oxygen)
Ionization energies
  1. 1313.9 kJ/mol
  2. 3388.3 kJ/mol
  3. 5300.5 kJ/mol
  4. 7469.2 kJ/mol
  5. 10989.5 kJ/mol
  6. 13326.5 kJ/mol
  7. 71330 kJ/mol
  8. 84078 kJ/mol
  1. 1681 kJ/mol
  2. 3374.2 kJ/mol
  3. 6050.4 kJ/mol
  4. 8407.7 kJ/mol
  5. 11022.7 kJ/mol
  6. 15164.1 kJ/mol
  7. 17868 kJ/mol
  8. 92038.1 kJ/mol
  9. 106434.3 kJ/mol

Electron configuration

OxygenFluorine
Shorthand configuration[He] 2s2 2p4 [He] 2s2 2p5
Full configuration1s2 2s2 2p4 1s2 2s2 2p5
Electrons per shell2, 62, 7

History

OxygenFluorine
DiscoveryCarl Wilhelm Scheele, Joseph Priestley (1774)André-Marie Ampère (1810)
First isolationHenri Moissan (1886)
Named byAntoine Lavoisier (1777)Humphry Davy, André-Marie Ampère
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