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 |