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Fluorine (F)

From Wikipedia, the free encyclopediaFluorine is a chemical element with symbol F and atomic number 9. It is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. As the most electronegative element, it is extremely reactive:almost all other elements, including some noble gases, form compounds with fluorine.

Fluorine in the periodic table

Atomic number9
Element categoryNonmetal

Physical properties

Phase at STPGas
Density1.696 g/cm3
Atomic weight18.9984 u
Melting point53.48 K
-219.67 °C
-363.406 °F
Boiling point85.03 K
-188.12 °C
-306.616 °F

Atomic properties

Electronegativity (Pauling Scale)3.98
Electron affinity328.165 kJ/mol
Oxidation states−1, 0
(oxidizes oxygen)
Ionization energies
11681 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

Elektronkonfiguration (shorthand)[He] 2s2 2p5
Electron configuration1s2 2s2 2p5
Electrons per shell2, 7


Discovered byAndré-Marie Ampère
Named byHumphry Davy
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