Atomic number 1
Name Hydrogen
Atomic mass 1.008
Electronic configuration 1s1
Electronegativity 2.2
Atomic radius 37 pm
Ion radius pm
Van der Waals radius 120 pm
Ionization energy 1312 kJ/mol
Electron affinity -73 kJ/mol
Oxidation states -1, 1
Standard physical state gas
Bonding type diatomic
Melting point 14 °C
Boiling point 20 °C
Density 0.0000899 g/cm³
Type nonmetal
Year discovered 1766