Hydrogen
Atomic number:
1
Atomic weight:
1.00794
Melting point:
-255.34°C
Boiling point:
-252.87°C
Covalent radius:
0.32
Å
Atomic volume:
14.4
cm³/mol
Atomic radius:
0.79
Å
Ionic radius:
1.54(+1)
Å
Electronegativity:
2.20
Oxidation states:
±1
1st ionization pot.:
13.5984
V
2nd ionization pot.:
--
V
3rd ionization pot.:
--
V
Specific heat:
14.304
J/gK
Heat of fusion:
0.05868
kJ/mol
Heat of vapor.:
0.44936
kJ/mol
Thermal conduct.:
0.001815
W/cmK
Electrical conduct.:
--
10^6/cm ohm
Density:
0.00008988
g/cm³
Valence:
1
