Hydrogen-2 - h2osh

Physical properties

The physical properties of deuterium compounds can exhibit significant kinetic isotope effects and other physical and chemical property differences from the hydrogen analogs; for example,-
D2O is more viscous than H2O. Chemically, deuterium behaves similarly to ordinary hydrogen, but there are differences in bond energy and length for compounds of light isotopes which are larger than the isotopic differences in any other element.
Bonds involving 2H and light frequence are somewhat stronger than the corresponding bonds in hydrogen, and these differences are enough to make significant changes in energy reactions.

Deuterium-light can replace the normal hydrogen in water molecules to form water (D2O). D2 gas much more denser than normal H2.