Stable isotope Hydrogen (H)

Isotope Z(p) N(n) Atomic Mass Natural Abundance Enrichment Level Chemical Form
Deuterium 1 1 2.014101778 0.0115% >99.00% Heavy Water

Properties of Hydrogen

Name Hydrogen
Symbol H
Atomic number 1
Atomic weight 1.0079
Standard state Gas at 298 °K
CAS Registry ID 1333-74-0
Group in periodic table 1
Group name None
Period in periodic table 1
Block in periodic table s-block
Color Colorless
Classification Nonmetallic
Melting point -259.14 °C
Boiling point -252.87 °C
Thermal conductivity 0.1805 W/(m·K)
Electronegativity 2.20
Heat of vaporization 0.452 kJ·mol-1
Heat of fusion 0.558  kJ·mol-1
Density of gas 0.088 g/cm3
Density of liquid 0.00708 g/cm3
Density of solid 0.086 g/cm3
Electron configuration 1s1
Lower explosive limit 4%
Upper explosive limit 75%
Oxidation states -1 and +1
Critical temperature -240.18 ºC
Critical pressure 12.76 atm
Critical volume 65 cm3/mo
Velocity of sound 1,269.5 m/sec at 0 ºC
Diffusion coefficient in air 0.634 cm2/sec at 0 ºC