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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

SymbolF
Atomic number9
Group17
Period2
Blockp
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

History

Discovered1810
Discovered byAndré-Marie Ampère
Named byHumphry Davy
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