Comparison of Oxygen and Fluorine

Attribute	Fluorine ×	Oxygen ×
Atomic mass (u)	18.99840316	15.999
Standard state	Gas	Gas
Oxidation states	-1	-2
Electron configuration	[He]2s²2p⁵	[He]2s²2p⁴
Atomic radius (van der waals) (pm)	135	152
Electronegativity (pauling scale)	3.98	3.44
Electron affinity (eV)	3.339	1.461
Ionization energy (eV)	17.423	13.618
Boiling point (K)	85.03	90.2
Melting point (K)	53.53	54.36
Density (g/cm³)	0.001696	0.001429
Atomic number	9	8
Group name	Halogen	Nonmetal
Discovered (year)	1670	1774
Symbol	F	O