Because living tissue is biocompatible with titanium alloys, they are also used in surgical implantations. The chemical element nitrogen is a colorless and odorless gas. Nitrogen s chemical symbol is N, atomic weight is 14.0067 and atomic number is 7. Nitrogen is the most abundant unconbined element. One of the few elements found unconbined in nature.
Oxides of nitrogen are major sources of atmophereic pollution.
To transform nitrogen into a liquid, the gas must be deprived of energy by cooling.