Comparison of Fluorine and Argon

Attribute	Argon ×	Fluorine ×
Atomic mass (u)	39.9	18.99840316
Standard state	Gas	Gas
Oxidation states	0	-1
Electron configuration	[Ne]3s²3p⁶	[He]2s²2p⁵
Atomic radius (van der waals) (pm)	188	135
Electronegativity (pauling scale)	-	3.98
Electron affinity (eV)	-	3.339
Ionization energy (eV)	15.76	17.423
Boiling point (K)	87.3	85.03
Melting point (K)	83.8	53.53
Density (g/cm³)	0.0017837	0.001696
Atomic number	18	9
Group name	Noble gas	Halogen
Symbol	Ar	F
Discovered (year)	1894	1670