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Compare Fluorine vs Oxygen

Comparing Fluorine (F) and Oxygen (O). Atomic numbers 9 and 8 with atomic masses 18.998 u and 15.999 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
F
Fluorine
#9
O
Oxygen
#8

Periodic properties of the elements

FluorineOxygen
SymbolFO
Atomic number98
Group1716
Period22
Blockpp
Element categoryNonmetalNonmetal

Physical properties

FluorineOxygen
Phase at STPGasGas
Density1.696 g/cm31.429 g/cm3
Atomic weight18.9984 u15.999 u
Melting point53.48 K
-219.67 °C
-363.406 °F		54.36 K
-218.79 °C
-361.822 °F
Boiling point85.03 K
-188.12 °C
-306.616 °F		90.188 K
-182.962 °C
-297.3316 °F

Atomic properties

FluorineOxygen
Electronegativity (Pauling Scale)3.983.44
Electron affinity328.165 kJ/mol140.976 kJ/mol
Oxidation states−1, 0
(oxidizes oxygen)		−2, −1, 0, +1, +2
()
Ionization energies
  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
  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

Electron configuration

FluorineOxygen
Shorthand configuration[He] 2s2 2p5 [He] 2s2 2p4
Full configuration1s2 2s2 2p5 1s2 2s2 2p4
Electrons per shell2, 72, 6

History

FluorineOxygen
DiscoveryAndré-Marie Ampère (1810)Carl Wilhelm Scheele, Joseph Priestley (1774)
First isolationHenri Moissan (1886)
Named byHumphry Davy, André-Marie AmpèreAntoine Lavoisier (1777)
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