Template:Infobox fluorine

Fluorine,  ₉F

Template:Infobox element/symbol-to-top-image-caption
General properties
Pronunciation	Template:Infobox element/pronunciation
Allotropes	alpha, beta
Appearance	gas: very pale yellow liquid: bright yellow solid: alpha is opaque, beta is transparent
Standard atomic weight (Ar, standard)	Template:Infobox element/standard atomic weight
Mass number	Template:Infobox element/symbol-to-most-stable-isotope (most stable isotope)
Fluorine in the periodic table
Template:Infobox element/periodic table
Atomic number (Z)	9
Group	Template:Infobox element/group
Period	period 2
Block	p-block
Element category	Template:Infobox element/category format
Electron configuration	[He] 2s2 2p5Template:Sfn
Electrons per shell	2, 7
Physical properties
Phase at STP	gas
Melting point	53.48 K ​(−219.67 °C, ​−363.41 °F)Template:Sfn
Boiling point	85.03 K ​(−188.11 °C, ​−306.60 °F)Template:Sfn
Density (at STP)	1.696 g/LTemplate:Sfn
when liquid (at b.p.)	1.505 g/cm3Template:Sfn
Triple point	53.48 K, ​90 kPaTemplate:Sfn
Critical point	144.41 K, 5.1724 MPaTemplate:Sfn
[[Enthalpy of vaporization|Heat of Template:Engvar]]	6.51 kJ/molTemplate:Sfn
Molar heat capacity	Cp: 31 J/(mol·K)Template:Sfn (at 21.1 °C) Cv: 23 J/(mol·K)Template:Sfn (at 21.1 °C)
[[Vapor pressure|Template:Engvar pressure]] Template:Infobox element/vapor pressure table
Atomic properties
Oxidation states	Template:Infobox element/symbol-to-oxidation-state
Electronegativity	Pauling scale: 3.98Template:Sfn
[[Ionization energy|Template:Engvar energies]]	1st: 1681 kJ/mol 2nd: 3374 kJ/mol 3rd: 6147 kJ/mol (more)Template:Sfn
Covalent radius	64 pmTemplate:Sfn
Van der Waals radius	135 pmTemplate:Sfn
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Other properties
Crystal structure	​Template:Infobox element/crystal structure Template:Infobox element/crystal structure
Thermal conductivity	0.02591 W/(m·K)Template:Sfn
Magnetic ordering	diamagnetic (−1.2×10−4)Template:SfnTemplate:Sfn
CAS Number	7782-41-4Template:Sfn
History
Naming	after the mineral fluorite, itself named after Latin fluo (to flow, in smelting)
Discovery	André-Marie Ampère (1810)
First isolation	Henri MoissanTemplate:Sfn (June 26, 1886)
Named by	Humphry Davy
Main isotopes of fluorineTemplate:Sfn
Template:Infobox element/isotopes table

Template:Infobox element/element navigation Template:Template reference list One of these is a named reference. It may be cited in the containing article as

• <ref name="CIAAW2016" /> for the source Atomic weights of the elements 2013 (from subtemplates used by {{Infobox element}})

The others are shortened footnotes created with {{sfn}}. In the Flourine article they are hyperlinked to sources in the list at Flourine#Indexed references.