Hydrogen

Symbol | H
Latin name | Hydrogenium
Atomic number | 1
Period | 1
Element category | Nonmetals
Relative atomic mass | 1.00794
Group | I.A
Electronegativity | 2.1
Oxidation numbers | -1, 1
Electron configuration | 1s1
Density [g/cm3] | 0.00008988
State | Gas
Melting point [°C] | -259.34
Boiling point [°C] | -252.87
Critical point [°C] | -240.18
Critical pressure [MPa] | 1.293
Atomic radius [pm] | 53
Covalent radius [pm] | 37
Thermal conductivity [W m-1K-1] | 0.1815
Heat capacity [J K-1g-1] | 14.304
Discovery | 1766
Stable isotopes | 2
Unstable isotopes | 1