Comparison of Nitrogen and Oxygen

Attribute	Oxygen ×	Nitrogen ×
Standard state	Gas	Gas
Electron affinity (eV)	1.461	-
Electron configuration	[He]2s²2p⁴	[He]2s²2p³
Atomic mass (u)	15.999	14.007
Electronegativity (pauling scale)	3.44	3.04
Oxidation states	-2	-3 -2 -1 +1 +2 +3 +4 +5
Ionization energy (eV)	13.618	14.534
Atomic radius (van der waals) (pm)	152	155
Boiling point (K)	90.2	77.36
Melting point (K)	54.36	63.15
Density (g/cm³)	0.001429	0.0012506
Atomic number	8	7
Group name	Nonmetal	Nonmetal
Discovered (year)	1774	1772
Symbol	O	N