Comparison of Hydrogen and Oxygen

Attribute	Oxygen ×	Hydrogen ×
Atomic mass (u)	15.999	1.008
Standard state	Gas	Gas
Oxidation states	-2	-1 +1
Electron configuration	[He]2s²2p⁴	1s¹
Atomic radius (van der waals) (pm)	152	120
Electronegativity (pauling scale)	3.44	2.2
Electron affinity (eV)	1.461	0.754
Ionization energy (eV)	13.618	13.598
Boiling point (K)	90.2	20.28
Melting point (K)	54.36	13.81
Density (g/cm³)	0.001429	8.988E-5
Atomic number	8	1
Group name	Nonmetal	Nonmetal
Discovered (year)	1774	1766
Symbol	O	H